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Theorem metustexhalf 22408
Description: For any element 𝐴 of the filter base generated by the metric 𝐷, the half element (corresponding to half the distance) is also in this base. (Contributed by Thierry Arnoux, 28-Nov-2017.) (Revised by Thierry Arnoux, 11-Feb-2018.)
Hypothesis
Ref Expression
metust.1 𝐹 = ran (𝑎 ∈ ℝ+ ↦ (𝐷 “ (0[,)𝑎)))
Assertion
Ref Expression
metustexhalf (((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) → ∃𝑣𝐹 (𝑣𝑣) ⊆ 𝐴)
Distinct variable groups:   𝐷,𝑎   𝑋,𝑎   𝐴,𝑎   𝐹,𝑎,𝑣   𝑣,𝐴   𝑣,𝐷   𝑣,𝐹   𝑣,𝑋

Proof of Theorem metustexhalf
Dummy variables 𝑏 𝑝 𝑞 𝑟 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 simp-4r 824 . . . 4 (((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) → 𝐷 ∈ (PsMet‘𝑋))
2 simplr 807 . . . . . 6 (((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) → 𝑎 ∈ ℝ+)
32rphalfcld 11922 . . . . 5 (((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) → (𝑎 / 2) ∈ ℝ+)
4 eqidd 2652 . . . . 5 (((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) → (𝐷 “ (0[,)(𝑎 / 2))) = (𝐷 “ (0[,)(𝑎 / 2))))
5 oveq2 6698 . . . . . . . 8 (𝑏 = (𝑎 / 2) → (0[,)𝑏) = (0[,)(𝑎 / 2)))
65imaeq2d 5501 . . . . . . 7 (𝑏 = (𝑎 / 2) → (𝐷 “ (0[,)𝑏)) = (𝐷 “ (0[,)(𝑎 / 2))))
76eqeq2d 2661 . . . . . 6 (𝑏 = (𝑎 / 2) → ((𝐷 “ (0[,)(𝑎 / 2))) = (𝐷 “ (0[,)𝑏)) ↔ (𝐷 “ (0[,)(𝑎 / 2))) = (𝐷 “ (0[,)(𝑎 / 2)))))
87rspcev 3340 . . . . 5 (((𝑎 / 2) ∈ ℝ+ ∧ (𝐷 “ (0[,)(𝑎 / 2))) = (𝐷 “ (0[,)(𝑎 / 2)))) → ∃𝑏 ∈ ℝ+ (𝐷 “ (0[,)(𝑎 / 2))) = (𝐷 “ (0[,)𝑏)))
93, 4, 8syl2anc 694 . . . 4 (((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) → ∃𝑏 ∈ ℝ+ (𝐷 “ (0[,)(𝑎 / 2))) = (𝐷 “ (0[,)𝑏)))
10 metust.1 . . . . . . 7 𝐹 = ran (𝑎 ∈ ℝ+ ↦ (𝐷 “ (0[,)𝑎)))
11 oveq2 6698 . . . . . . . . . 10 (𝑎 = 𝑏 → (0[,)𝑎) = (0[,)𝑏))
1211imaeq2d 5501 . . . . . . . . 9 (𝑎 = 𝑏 → (𝐷 “ (0[,)𝑎)) = (𝐷 “ (0[,)𝑏)))
1312cbvmptv 4783 . . . . . . . 8 (𝑎 ∈ ℝ+ ↦ (𝐷 “ (0[,)𝑎))) = (𝑏 ∈ ℝ+ ↦ (𝐷 “ (0[,)𝑏)))
1413rneqi 5384 . . . . . . 7 ran (𝑎 ∈ ℝ+ ↦ (𝐷 “ (0[,)𝑎))) = ran (𝑏 ∈ ℝ+ ↦ (𝐷 “ (0[,)𝑏)))
1510, 14eqtri 2673 . . . . . 6 𝐹 = ran (𝑏 ∈ ℝ+ ↦ (𝐷 “ (0[,)𝑏)))
1615metustel 22402 . . . . 5 (𝐷 ∈ (PsMet‘𝑋) → ((𝐷 “ (0[,)(𝑎 / 2))) ∈ 𝐹 ↔ ∃𝑏 ∈ ℝ+ (𝐷 “ (0[,)(𝑎 / 2))) = (𝐷 “ (0[,)𝑏))))
1716biimpar 501 . . . 4 ((𝐷 ∈ (PsMet‘𝑋) ∧ ∃𝑏 ∈ ℝ+ (𝐷 “ (0[,)(𝑎 / 2))) = (𝐷 “ (0[,)𝑏))) → (𝐷 “ (0[,)(𝑎 / 2))) ∈ 𝐹)
181, 9, 17syl2anc 694 . . 3 (((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) → (𝐷 “ (0[,)(𝑎 / 2))) ∈ 𝐹)
19 relco 5671 . . . . 5 Rel ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))
2019a1i 11 . . . 4 (((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) → Rel ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2)))))
21 cossxp 5696 . . . . . . . . . 10 ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2)))) ⊆ (dom (𝐷 “ (0[,)(𝑎 / 2))) × ran (𝐷 “ (0[,)(𝑎 / 2))))
22 cnvimass 5520 . . . . . . . . . . . . . 14 (𝐷 “ (0[,)(𝑎 / 2))) ⊆ dom 𝐷
23 psmetf 22158 . . . . . . . . . . . . . . 15 (𝐷 ∈ (PsMet‘𝑋) → 𝐷:(𝑋 × 𝑋)⟶ℝ*)
24 fdm 6089 . . . . . . . . . . . . . . 15 (𝐷:(𝑋 × 𝑋)⟶ℝ* → dom 𝐷 = (𝑋 × 𝑋))
2523, 24syl 17 . . . . . . . . . . . . . 14 (𝐷 ∈ (PsMet‘𝑋) → dom 𝐷 = (𝑋 × 𝑋))
2622, 25syl5sseq 3686 . . . . . . . . . . . . 13 (𝐷 ∈ (PsMet‘𝑋) → (𝐷 “ (0[,)(𝑎 / 2))) ⊆ (𝑋 × 𝑋))
27 dmss 5355 . . . . . . . . . . . . . 14 ((𝐷 “ (0[,)(𝑎 / 2))) ⊆ (𝑋 × 𝑋) → dom (𝐷 “ (0[,)(𝑎 / 2))) ⊆ dom (𝑋 × 𝑋))
28 rnss 5386 . . . . . . . . . . . . . 14 ((𝐷 “ (0[,)(𝑎 / 2))) ⊆ (𝑋 × 𝑋) → ran (𝐷 “ (0[,)(𝑎 / 2))) ⊆ ran (𝑋 × 𝑋))
29 xpss12 5158 . . . . . . . . . . . . . 14 ((dom (𝐷 “ (0[,)(𝑎 / 2))) ⊆ dom (𝑋 × 𝑋) ∧ ran (𝐷 “ (0[,)(𝑎 / 2))) ⊆ ran (𝑋 × 𝑋)) → (dom (𝐷 “ (0[,)(𝑎 / 2))) × ran (𝐷 “ (0[,)(𝑎 / 2)))) ⊆ (dom (𝑋 × 𝑋) × ran (𝑋 × 𝑋)))
3027, 28, 29syl2anc 694 . . . . . . . . . . . . 13 ((𝐷 “ (0[,)(𝑎 / 2))) ⊆ (𝑋 × 𝑋) → (dom (𝐷 “ (0[,)(𝑎 / 2))) × ran (𝐷 “ (0[,)(𝑎 / 2)))) ⊆ (dom (𝑋 × 𝑋) × ran (𝑋 × 𝑋)))
3126, 30syl 17 . . . . . . . . . . . 12 (𝐷 ∈ (PsMet‘𝑋) → (dom (𝐷 “ (0[,)(𝑎 / 2))) × ran (𝐷 “ (0[,)(𝑎 / 2)))) ⊆ (dom (𝑋 × 𝑋) × ran (𝑋 × 𝑋)))
3231adantl 481 . . . . . . . . . . 11 ((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) → (dom (𝐷 “ (0[,)(𝑎 / 2))) × ran (𝐷 “ (0[,)(𝑎 / 2)))) ⊆ (dom (𝑋 × 𝑋) × ran (𝑋 × 𝑋)))
33 dmxp 5376 . . . . . . . . . . . . 13 (𝑋 ≠ ∅ → dom (𝑋 × 𝑋) = 𝑋)
34 rnxp 5599 . . . . . . . . . . . . 13 (𝑋 ≠ ∅ → ran (𝑋 × 𝑋) = 𝑋)
3533, 34xpeq12d 5174 . . . . . . . . . . . 12 (𝑋 ≠ ∅ → (dom (𝑋 × 𝑋) × ran (𝑋 × 𝑋)) = (𝑋 × 𝑋))
3635adantr 480 . . . . . . . . . . 11 ((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) → (dom (𝑋 × 𝑋) × ran (𝑋 × 𝑋)) = (𝑋 × 𝑋))
3732, 36sseqtrd 3674 . . . . . . . . . 10 ((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) → (dom (𝐷 “ (0[,)(𝑎 / 2))) × ran (𝐷 “ (0[,)(𝑎 / 2)))) ⊆ (𝑋 × 𝑋))
3821, 37syl5ss 3647 . . . . . . . . 9 ((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) → ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2)))) ⊆ (𝑋 × 𝑋))
3938ad3antrrr 766 . . . . . . . 8 (((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) → ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2)))) ⊆ (𝑋 × 𝑋))
4039sselda 3636 . . . . . . 7 ((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) → ⟨𝑝, 𝑞⟩ ∈ (𝑋 × 𝑋))
41 opelxp 5180 . . . . . . 7 (⟨𝑝, 𝑞⟩ ∈ (𝑋 × 𝑋) ↔ (𝑝𝑋𝑞𝑋))
4240, 41sylib 208 . . . . . 6 ((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) → (𝑝𝑋𝑞𝑋))
43 simpll 805 . . . . . . 7 (((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ (𝑝𝑋𝑞𝑋)) → ((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))))
44 simprl 809 . . . . . . 7 (((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ (𝑝𝑋𝑞𝑋)) → 𝑝𝑋)
45 simprr 811 . . . . . . 7 (((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ (𝑝𝑋𝑞𝑋)) → 𝑞𝑋)
46 simplr 807 . . . . . . 7 (((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ (𝑝𝑋𝑞𝑋)) → ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2)))))
47 simplll 813 . . . . . . . . . . . . . . 15 (((((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋))
4847simp1d 1093 . . . . . . . . . . . . . 14 (((((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → ((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))))
4948, 1syl 17 . . . . . . . . . . . . 13 (((((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝐷 ∈ (PsMet‘𝑋))
5048, 2syl 17 . . . . . . . . . . . . 13 (((((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝑎 ∈ ℝ+)
5149, 50jca 553 . . . . . . . . . . . 12 (((((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+))
5247simp2d 1094 . . . . . . . . . . . 12 (((((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝑝𝑋)
5347simp3d 1095 . . . . . . . . . . . 12 (((((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝑞𝑋)
5451, 52, 533jca 1261 . . . . . . . . . . 11 (((((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → ((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋))
55 simplr 807 . . . . . . . . . . 11 (((((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝑟𝑋)
56 simprl 809 . . . . . . . . . . 11 (((((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟)
57 simprr 811 . . . . . . . . . . 11 (((((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)
58 simpll 805 . . . . . . . . . . . . . . 15 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → ((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋))
5958simp1d 1093 . . . . . . . . . . . . . 14 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+))
6059simpld 474 . . . . . . . . . . . . 13 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝐷 ∈ (PsMet‘𝑋))
61 ffun 6086 . . . . . . . . . . . . . 14 (𝐷:(𝑋 × 𝑋)⟶ℝ* → Fun 𝐷)
6223, 61syl 17 . . . . . . . . . . . . 13 (𝐷 ∈ (PsMet‘𝑋) → Fun 𝐷)
6360, 62syl 17 . . . . . . . . . . . 12 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → Fun 𝐷)
6458simp2d 1094 . . . . . . . . . . . . . 14 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝑝𝑋)
6558simp3d 1095 . . . . . . . . . . . . . 14 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝑞𝑋)
6664, 65, 41sylanbrc 699 . . . . . . . . . . . . 13 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → ⟨𝑝, 𝑞⟩ ∈ (𝑋 × 𝑋))
6760, 25syl 17 . . . . . . . . . . . . 13 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → dom 𝐷 = (𝑋 × 𝑋))
6866, 67eleqtrrd 2733 . . . . . . . . . . . 12 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → ⟨𝑝, 𝑞⟩ ∈ dom 𝐷)
69 0xr 10124 . . . . . . . . . . . . . 14 0 ∈ ℝ*
7069a1i 11 . . . . . . . . . . . . 13 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 0 ∈ ℝ*)
7159simprd 478 . . . . . . . . . . . . . 14 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝑎 ∈ ℝ+)
7271rpxrd 11911 . . . . . . . . . . . . 13 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝑎 ∈ ℝ*)
7360, 23syl 17 . . . . . . . . . . . . . 14 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝐷:(𝑋 × 𝑋)⟶ℝ*)
7473, 66ffvelrnd 6400 . . . . . . . . . . . . 13 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝐷‘⟨𝑝, 𝑞⟩) ∈ ℝ*)
75 psmetge0 22164 . . . . . . . . . . . . . . 15 ((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑝𝑋𝑞𝑋) → 0 ≤ (𝑝𝐷𝑞))
7660, 64, 65, 75syl3anc 1366 . . . . . . . . . . . . . 14 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 0 ≤ (𝑝𝐷𝑞))
77 df-ov 6693 . . . . . . . . . . . . . 14 (𝑝𝐷𝑞) = (𝐷‘⟨𝑝, 𝑞⟩)
7876, 77syl6breq 4726 . . . . . . . . . . . . 13 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 0 ≤ (𝐷‘⟨𝑝, 𝑞⟩))
7977, 74syl5eqel 2734 . . . . . . . . . . . . . . 15 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝑝𝐷𝑞) ∈ ℝ*)
80 0red 10079 . . . . . . . . . . . . . . . . . . 19 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 0 ∈ ℝ)
8171rpred 11910 . . . . . . . . . . . . . . . . . . . . 21 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝑎 ∈ ℝ)
8281rehalfcld 11317 . . . . . . . . . . . . . . . . . . . 20 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝑎 / 2) ∈ ℝ)
8382rexrd 10127 . . . . . . . . . . . . . . . . . . 19 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝑎 / 2) ∈ ℝ*)
84 df-ov 6693 . . . . . . . . . . . . . . . . . . . 20 (𝑝𝐷𝑟) = (𝐷‘⟨𝑝, 𝑟⟩)
85 simplr 807 . . . . . . . . . . . . . . . . . . . . . . 23 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝑟𝑋)
86 opelxp 5180 . . . . . . . . . . . . . . . . . . . . . . 23 (⟨𝑝, 𝑟⟩ ∈ (𝑋 × 𝑋) ↔ (𝑝𝑋𝑟𝑋))
8764, 85, 86sylanbrc 699 . . . . . . . . . . . . . . . . . . . . . 22 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → ⟨𝑝, 𝑟⟩ ∈ (𝑋 × 𝑋))
8887, 67eleqtrrd 2733 . . . . . . . . . . . . . . . . . . . . 21 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → ⟨𝑝, 𝑟⟩ ∈ dom 𝐷)
89 simprl 809 . . . . . . . . . . . . . . . . . . . . . 22 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟)
90 df-br 4686 . . . . . . . . . . . . . . . . . . . . . 22 (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟 ↔ ⟨𝑝, 𝑟⟩ ∈ (𝐷 “ (0[,)(𝑎 / 2))))
9189, 90sylib 208 . . . . . . . . . . . . . . . . . . . . 21 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → ⟨𝑝, 𝑟⟩ ∈ (𝐷 “ (0[,)(𝑎 / 2))))
92 fvimacnv 6372 . . . . . . . . . . . . . . . . . . . . . 22 ((Fun 𝐷 ∧ ⟨𝑝, 𝑟⟩ ∈ dom 𝐷) → ((𝐷‘⟨𝑝, 𝑟⟩) ∈ (0[,)(𝑎 / 2)) ↔ ⟨𝑝, 𝑟⟩ ∈ (𝐷 “ (0[,)(𝑎 / 2)))))
9392biimpar 501 . . . . . . . . . . . . . . . . . . . . 21 (((Fun 𝐷 ∧ ⟨𝑝, 𝑟⟩ ∈ dom 𝐷) ∧ ⟨𝑝, 𝑟⟩ ∈ (𝐷 “ (0[,)(𝑎 / 2)))) → (𝐷‘⟨𝑝, 𝑟⟩) ∈ (0[,)(𝑎 / 2)))
9463, 88, 91, 93syl21anc 1365 . . . . . . . . . . . . . . . . . . . 20 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝐷‘⟨𝑝, 𝑟⟩) ∈ (0[,)(𝑎 / 2)))
9584, 94syl5eqel 2734 . . . . . . . . . . . . . . . . . . 19 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝑝𝐷𝑟) ∈ (0[,)(𝑎 / 2)))
96 elico2 12275 . . . . . . . . . . . . . . . . . . . . 21 ((0 ∈ ℝ ∧ (𝑎 / 2) ∈ ℝ*) → ((𝑝𝐷𝑟) ∈ (0[,)(𝑎 / 2)) ↔ ((𝑝𝐷𝑟) ∈ ℝ ∧ 0 ≤ (𝑝𝐷𝑟) ∧ (𝑝𝐷𝑟) < (𝑎 / 2))))
9796biimpa 500 . . . . . . . . . . . . . . . . . . . 20 (((0 ∈ ℝ ∧ (𝑎 / 2) ∈ ℝ*) ∧ (𝑝𝐷𝑟) ∈ (0[,)(𝑎 / 2))) → ((𝑝𝐷𝑟) ∈ ℝ ∧ 0 ≤ (𝑝𝐷𝑟) ∧ (𝑝𝐷𝑟) < (𝑎 / 2)))
9897simp1d 1093 . . . . . . . . . . . . . . . . . . 19 (((0 ∈ ℝ ∧ (𝑎 / 2) ∈ ℝ*) ∧ (𝑝𝐷𝑟) ∈ (0[,)(𝑎 / 2))) → (𝑝𝐷𝑟) ∈ ℝ)
9980, 83, 95, 98syl21anc 1365 . . . . . . . . . . . . . . . . . 18 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝑝𝐷𝑟) ∈ ℝ)
100 df-ov 6693 . . . . . . . . . . . . . . . . . . . 20 (𝑟𝐷𝑞) = (𝐷‘⟨𝑟, 𝑞⟩)
101 opelxp 5180 . . . . . . . . . . . . . . . . . . . . . . 23 (⟨𝑟, 𝑞⟩ ∈ (𝑋 × 𝑋) ↔ (𝑟𝑋𝑞𝑋))
10285, 65, 101sylanbrc 699 . . . . . . . . . . . . . . . . . . . . . 22 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → ⟨𝑟, 𝑞⟩ ∈ (𝑋 × 𝑋))
103102, 67eleqtrrd 2733 . . . . . . . . . . . . . . . . . . . . 21 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → ⟨𝑟, 𝑞⟩ ∈ dom 𝐷)
104 simprr 811 . . . . . . . . . . . . . . . . . . . . . 22 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)
105 df-br 4686 . . . . . . . . . . . . . . . . . . . . . 22 (𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞 ↔ ⟨𝑟, 𝑞⟩ ∈ (𝐷 “ (0[,)(𝑎 / 2))))
106104, 105sylib 208 . . . . . . . . . . . . . . . . . . . . 21 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → ⟨𝑟, 𝑞⟩ ∈ (𝐷 “ (0[,)(𝑎 / 2))))
107 fvimacnv 6372 . . . . . . . . . . . . . . . . . . . . . 22 ((Fun 𝐷 ∧ ⟨𝑟, 𝑞⟩ ∈ dom 𝐷) → ((𝐷‘⟨𝑟, 𝑞⟩) ∈ (0[,)(𝑎 / 2)) ↔ ⟨𝑟, 𝑞⟩ ∈ (𝐷 “ (0[,)(𝑎 / 2)))))
108107biimpar 501 . . . . . . . . . . . . . . . . . . . . 21 (((Fun 𝐷 ∧ ⟨𝑟, 𝑞⟩ ∈ dom 𝐷) ∧ ⟨𝑟, 𝑞⟩ ∈ (𝐷 “ (0[,)(𝑎 / 2)))) → (𝐷‘⟨𝑟, 𝑞⟩) ∈ (0[,)(𝑎 / 2)))
10963, 103, 106, 108syl21anc 1365 . . . . . . . . . . . . . . . . . . . 20 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝐷‘⟨𝑟, 𝑞⟩) ∈ (0[,)(𝑎 / 2)))
110100, 109syl5eqel 2734 . . . . . . . . . . . . . . . . . . 19 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝑟𝐷𝑞) ∈ (0[,)(𝑎 / 2)))
111 elico2 12275 . . . . . . . . . . . . . . . . . . . . 21 ((0 ∈ ℝ ∧ (𝑎 / 2) ∈ ℝ*) → ((𝑟𝐷𝑞) ∈ (0[,)(𝑎 / 2)) ↔ ((𝑟𝐷𝑞) ∈ ℝ ∧ 0 ≤ (𝑟𝐷𝑞) ∧ (𝑟𝐷𝑞) < (𝑎 / 2))))
112111biimpa 500 . . . . . . . . . . . . . . . . . . . 20 (((0 ∈ ℝ ∧ (𝑎 / 2) ∈ ℝ*) ∧ (𝑟𝐷𝑞) ∈ (0[,)(𝑎 / 2))) → ((𝑟𝐷𝑞) ∈ ℝ ∧ 0 ≤ (𝑟𝐷𝑞) ∧ (𝑟𝐷𝑞) < (𝑎 / 2)))
113112simp1d 1093 . . . . . . . . . . . . . . . . . . 19 (((0 ∈ ℝ ∧ (𝑎 / 2) ∈ ℝ*) ∧ (𝑟𝐷𝑞) ∈ (0[,)(𝑎 / 2))) → (𝑟𝐷𝑞) ∈ ℝ)
11480, 83, 110, 113syl21anc 1365 . . . . . . . . . . . . . . . . . 18 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝑟𝐷𝑞) ∈ ℝ)
115 rexadd 12101 . . . . . . . . . . . . . . . . . 18 (((𝑝𝐷𝑟) ∈ ℝ ∧ (𝑟𝐷𝑞) ∈ ℝ) → ((𝑝𝐷𝑟) +𝑒 (𝑟𝐷𝑞)) = ((𝑝𝐷𝑟) + (𝑟𝐷𝑞)))
11699, 114, 115syl2anc 694 . . . . . . . . . . . . . . . . 17 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → ((𝑝𝐷𝑟) +𝑒 (𝑟𝐷𝑞)) = ((𝑝𝐷𝑟) + (𝑟𝐷𝑞)))
11799, 114readdcld 10107 . . . . . . . . . . . . . . . . 17 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → ((𝑝𝐷𝑟) + (𝑟𝐷𝑞)) ∈ ℝ)
118116, 117eqeltrd 2730 . . . . . . . . . . . . . . . 16 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → ((𝑝𝐷𝑟) +𝑒 (𝑟𝐷𝑞)) ∈ ℝ)
119118rexrd 10127 . . . . . . . . . . . . . . 15 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → ((𝑝𝐷𝑟) +𝑒 (𝑟𝐷𝑞)) ∈ ℝ*)
120 psmettri 22163 . . . . . . . . . . . . . . . 16 ((𝐷 ∈ (PsMet‘𝑋) ∧ (𝑝𝑋𝑞𝑋𝑟𝑋)) → (𝑝𝐷𝑞) ≤ ((𝑝𝐷𝑟) +𝑒 (𝑟𝐷𝑞)))
12160, 64, 65, 85, 120syl13anc 1368 . . . . . . . . . . . . . . 15 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝑝𝐷𝑞) ≤ ((𝑝𝐷𝑟) +𝑒 (𝑟𝐷𝑞)))
12297simp3d 1095 . . . . . . . . . . . . . . . . . 18 (((0 ∈ ℝ ∧ (𝑎 / 2) ∈ ℝ*) ∧ (𝑝𝐷𝑟) ∈ (0[,)(𝑎 / 2))) → (𝑝𝐷𝑟) < (𝑎 / 2))
12380, 83, 95, 122syl21anc 1365 . . . . . . . . . . . . . . . . 17 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝑝𝐷𝑟) < (𝑎 / 2))
124112simp3d 1095 . . . . . . . . . . . . . . . . . 18 (((0 ∈ ℝ ∧ (𝑎 / 2) ∈ ℝ*) ∧ (𝑟𝐷𝑞) ∈ (0[,)(𝑎 / 2))) → (𝑟𝐷𝑞) < (𝑎 / 2))
12580, 83, 110, 124syl21anc 1365 . . . . . . . . . . . . . . . . 17 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝑟𝐷𝑞) < (𝑎 / 2))
12699, 114, 81, 123, 125lt2halvesd 11318 . . . . . . . . . . . . . . . 16 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → ((𝑝𝐷𝑟) + (𝑟𝐷𝑞)) < 𝑎)
127116, 126eqbrtrd 4707 . . . . . . . . . . . . . . 15 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → ((𝑝𝐷𝑟) +𝑒 (𝑟𝐷𝑞)) < 𝑎)
12879, 119, 72, 121, 127xrlelttrd 12029 . . . . . . . . . . . . . 14 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝑝𝐷𝑞) < 𝑎)
12977, 128syl5eqbrr 4721 . . . . . . . . . . . . 13 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝐷‘⟨𝑝, 𝑞⟩) < 𝑎)
130 elico1 12256 . . . . . . . . . . . . . 14 ((0 ∈ ℝ*𝑎 ∈ ℝ*) → ((𝐷‘⟨𝑝, 𝑞⟩) ∈ (0[,)𝑎) ↔ ((𝐷‘⟨𝑝, 𝑞⟩) ∈ ℝ* ∧ 0 ≤ (𝐷‘⟨𝑝, 𝑞⟩) ∧ (𝐷‘⟨𝑝, 𝑞⟩) < 𝑎)))
131130biimpar 501 . . . . . . . . . . . . 13 (((0 ∈ ℝ*𝑎 ∈ ℝ*) ∧ ((𝐷‘⟨𝑝, 𝑞⟩) ∈ ℝ* ∧ 0 ≤ (𝐷‘⟨𝑝, 𝑞⟩) ∧ (𝐷‘⟨𝑝, 𝑞⟩) < 𝑎)) → (𝐷‘⟨𝑝, 𝑞⟩) ∈ (0[,)𝑎))
13270, 72, 74, 78, 129, 131syl23anc 1373 . . . . . . . . . . . 12 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝐷‘⟨𝑝, 𝑞⟩) ∈ (0[,)𝑎))
133 fvimacnv 6372 . . . . . . . . . . . . . 14 ((Fun 𝐷 ∧ ⟨𝑝, 𝑞⟩ ∈ dom 𝐷) → ((𝐷‘⟨𝑝, 𝑞⟩) ∈ (0[,)𝑎) ↔ ⟨𝑝, 𝑞⟩ ∈ (𝐷 “ (0[,)𝑎))))
134133biimpa 500 . . . . . . . . . . . . 13 (((Fun 𝐷 ∧ ⟨𝑝, 𝑞⟩ ∈ dom 𝐷) ∧ (𝐷‘⟨𝑝, 𝑞⟩) ∈ (0[,)𝑎)) → ⟨𝑝, 𝑞⟩ ∈ (𝐷 “ (0[,)𝑎)))
135 df-br 4686 . . . . . . . . . . . . 13 (𝑝(𝐷 “ (0[,)𝑎))𝑞 ↔ ⟨𝑝, 𝑞⟩ ∈ (𝐷 “ (0[,)𝑎)))
136134, 135sylibr 224 . . . . . . . . . . . 12 (((Fun 𝐷 ∧ ⟨𝑝, 𝑞⟩ ∈ dom 𝐷) ∧ (𝐷‘⟨𝑝, 𝑞⟩) ∈ (0[,)𝑎)) → 𝑝(𝐷 “ (0[,)𝑎))𝑞)
13763, 68, 132, 136syl21anc 1365 . . . . . . . . . . 11 (((((𝐷 ∈ (PsMet‘𝑋) ∧ 𝑎 ∈ ℝ+) ∧ 𝑝𝑋𝑞𝑋) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝑝(𝐷 “ (0[,)𝑎))𝑞)
13854, 55, 56, 57, 137syl22anc 1367 . . . . . . . . . 10 (((((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝑝(𝐷 “ (0[,)𝑎))𝑞)
13948simprd 478 . . . . . . . . . . 11 (((((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝐴 = (𝐷 “ (0[,)𝑎)))
140139breqd 4696 . . . . . . . . . 10 (((((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → (𝑝𝐴𝑞𝑝(𝐷 “ (0[,)𝑎))𝑞))
141138, 140mpbird 247 . . . . . . . . 9 (((((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ 𝑟𝑋) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝑝𝐴𝑞)
142 simpr 476 . . . . . . . . . . . . 13 (((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) → ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2)))))
143 df-br 4686 . . . . . . . . . . . . 13 (𝑝((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))𝑞 ↔ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2)))))
144142, 143sylibr 224 . . . . . . . . . . . 12 (((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) → 𝑝((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))𝑞)
145 vex 3234 . . . . . . . . . . . . 13 𝑝 ∈ V
146 vex 3234 . . . . . . . . . . . . 13 𝑞 ∈ V
147145, 146brco 5325 . . . . . . . . . . . 12 (𝑝((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))𝑞 ↔ ∃𝑟(𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞))
148144, 147sylib 208 . . . . . . . . . . 11 (((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) → ∃𝑟(𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞))
14926adantl 481 . . . . . . . . . . . . . . . . . . . . . 22 ((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) → (𝐷 “ (0[,)(𝑎 / 2))) ⊆ (𝑋 × 𝑋))
150149, 28syl 17 . . . . . . . . . . . . . . . . . . . . 21 ((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) → ran (𝐷 “ (0[,)(𝑎 / 2))) ⊆ ran (𝑋 × 𝑋))
15134adantr 480 . . . . . . . . . . . . . . . . . . . . 21 ((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) → ran (𝑋 × 𝑋) = 𝑋)
152150, 151sseqtrd 3674 . . . . . . . . . . . . . . . . . . . 20 ((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) → ran (𝐷 “ (0[,)(𝑎 / 2))) ⊆ 𝑋)
153152adantr 480 . . . . . . . . . . . . . . . . . . 19 (((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟) → ran (𝐷 “ (0[,)(𝑎 / 2))) ⊆ 𝑋)
154 vex 3234 . . . . . . . . . . . . . . . . . . . . 21 𝑟 ∈ V
155145, 154brelrn 5388 . . . . . . . . . . . . . . . . . . . 20 (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟 ∈ ran (𝐷 “ (0[,)(𝑎 / 2))))
156155adantl 481 . . . . . . . . . . . . . . . . . . 19 (((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟) → 𝑟 ∈ ran (𝐷 “ (0[,)(𝑎 / 2))))
157153, 156sseldd 3637 . . . . . . . . . . . . . . . . . 18 (((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟) → 𝑟𝑋)
158157adantrr 753 . . . . . . . . . . . . . . . . 17 (((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)) → 𝑟𝑋)
159158ex 449 . . . . . . . . . . . . . . . 16 ((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) → ((𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞) → 𝑟𝑋))
160159ancrd 576 . . . . . . . . . . . . . . 15 ((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) → ((𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞) → (𝑟𝑋 ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞))))
161160eximdv 1886 . . . . . . . . . . . . . 14 ((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) → (∃𝑟(𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞) → ∃𝑟(𝑟𝑋 ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞))))
162161ad3antrrr 766 . . . . . . . . . . . . 13 (((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) → (∃𝑟(𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞) → ∃𝑟(𝑟𝑋 ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞))))
1631623ad2ant1 1102 . . . . . . . . . . . 12 ((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) → (∃𝑟(𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞) → ∃𝑟(𝑟𝑋 ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞))))
164163adantr 480 . . . . . . . . . . 11 (((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) → (∃𝑟(𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞) → ∃𝑟(𝑟𝑋 ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞))))
165148, 164mpd 15 . . . . . . . . . 10 (((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) → ∃𝑟(𝑟𝑋 ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)))
166 df-rex 2947 . . . . . . . . . 10 (∃𝑟𝑋 (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞) ↔ ∃𝑟(𝑟𝑋 ∧ (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞)))
167165, 166sylibr 224 . . . . . . . . 9 (((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) → ∃𝑟𝑋 (𝑝(𝐷 “ (0[,)(𝑎 / 2)))𝑟𝑟(𝐷 “ (0[,)(𝑎 / 2)))𝑞))
168141, 167r19.29a 3107 . . . . . . . 8 (((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) → 𝑝𝐴𝑞)
169 df-br 4686 . . . . . . . 8 (𝑝𝐴𝑞 ↔ ⟨𝑝, 𝑞⟩ ∈ 𝐴)
170168, 169sylib 208 . . . . . . 7 (((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ 𝑝𝑋𝑞𝑋) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) → ⟨𝑝, 𝑞⟩ ∈ 𝐴)
17143, 44, 45, 46, 170syl31anc 1369 . . . . . 6 (((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) ∧ (𝑝𝑋𝑞𝑋)) → ⟨𝑝, 𝑞⟩ ∈ 𝐴)
17242, 171mpdan 703 . . . . 5 ((((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) ∧ ⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2))))) → ⟨𝑝, 𝑞⟩ ∈ 𝐴)
173172ex 449 . . . 4 (((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) → (⟨𝑝, 𝑞⟩ ∈ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2)))) → ⟨𝑝, 𝑞⟩ ∈ 𝐴))
17420, 173relssdv 5246 . . 3 (((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) → ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2)))) ⊆ 𝐴)
175 id 22 . . . . . 6 (𝑣 = (𝐷 “ (0[,)(𝑎 / 2))) → 𝑣 = (𝐷 “ (0[,)(𝑎 / 2))))
176175, 175coeq12d 5319 . . . . 5 (𝑣 = (𝐷 “ (0[,)(𝑎 / 2))) → (𝑣𝑣) = ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2)))))
177176sseq1d 3665 . . . 4 (𝑣 = (𝐷 “ (0[,)(𝑎 / 2))) → ((𝑣𝑣) ⊆ 𝐴 ↔ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2)))) ⊆ 𝐴))
178177rspcev 3340 . . 3 (((𝐷 “ (0[,)(𝑎 / 2))) ∈ 𝐹 ∧ ((𝐷 “ (0[,)(𝑎 / 2))) ∘ (𝐷 “ (0[,)(𝑎 / 2)))) ⊆ 𝐴) → ∃𝑣𝐹 (𝑣𝑣) ⊆ 𝐴)
17918, 174, 178syl2anc 694 . 2 (((((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) ∧ 𝑎 ∈ ℝ+) ∧ 𝐴 = (𝐷 “ (0[,)𝑎))) → ∃𝑣𝐹 (𝑣𝑣) ⊆ 𝐴)
18010metustel 22402 . . . 4 (𝐷 ∈ (PsMet‘𝑋) → (𝐴𝐹 ↔ ∃𝑎 ∈ ℝ+ 𝐴 = (𝐷 “ (0[,)𝑎))))
181180adantl 481 . . 3 ((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) → (𝐴𝐹 ↔ ∃𝑎 ∈ ℝ+ 𝐴 = (𝐷 “ (0[,)𝑎))))
182181biimpa 500 . 2 (((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) → ∃𝑎 ∈ ℝ+ 𝐴 = (𝐷 “ (0[,)𝑎)))
183179, 182r19.29a 3107 1 (((𝑋 ≠ ∅ ∧ 𝐷 ∈ (PsMet‘𝑋)) ∧ 𝐴𝐹) → ∃𝑣𝐹 (𝑣𝑣) ⊆ 𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 383  w3a 1054   = wceq 1523  wex 1744  wcel 2030  wne 2823  wrex 2942  wss 3607  c0 3948  cop 4216   class class class wbr 4685  cmpt 4762   × cxp 5141  ccnv 5142  dom cdm 5143  ran crn 5144  cima 5146  ccom 5147  Rel wrel 5148  Fun wfun 5920  wf 5922  cfv 5926  (class class class)co 6690  cr 9973  0cc0 9974   + caddc 9977  *cxr 10111   < clt 10112  cle 10113   / cdiv 10722  2c2 11108  +crp 11870   +𝑒 cxad 11982  [,)cico 12215  PsMetcpsmet 19778
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991  ax-cnex 10030  ax-resscn 10031  ax-1cn 10032  ax-icn 10033  ax-addcl 10034  ax-addrcl 10035  ax-mulcl 10036  ax-mulrcl 10037  ax-mulcom 10038  ax-addass 10039  ax-mulass 10040  ax-distr 10041  ax-i2m1 10042  ax-1ne0 10043  ax-1rid 10044  ax-rnegex 10045  ax-rrecex 10046  ax-cnre 10047  ax-pre-lttri 10048  ax-pre-lttrn 10049  ax-pre-ltadd 10050  ax-pre-mulgt0 10051
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1055  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-nel 2927  df-ral 2946  df-rex 2947  df-reu 2948  df-rmo 2949  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-op 4217  df-uni 4469  df-iun 4554  df-br 4686  df-opab 4746  df-mpt 4763  df-id 5053  df-po 5064  df-so 5065  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-riota 6651  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-1st 7210  df-2nd 7211  df-er 7787  df-map 7901  df-en 7998  df-dom 7999  df-sdom 8000  df-pnf 10114  df-mnf 10115  df-xr 10116  df-ltxr 10117  df-le 10118  df-sub 10306  df-neg 10307  df-div 10723  df-2 11117  df-rp 11871  df-xneg 11984  df-xadd 11985  df-xmul 11986  df-ico 12219  df-psmet 19786
This theorem is referenced by:  metust  22410
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