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Theorem txlly 21659
 Description: If the property 𝐴 is preserved under topological products, then so is the property of being locally 𝐴. (Contributed by Mario Carneiro, 10-Mar-2015.)
Hypothesis
Ref Expression
txlly.1 ((𝑗𝐴𝑘𝐴) → (𝑗 ×t 𝑘) ∈ 𝐴)
Assertion
Ref Expression
txlly ((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) → (𝑅 ×t 𝑆) ∈ Locally 𝐴)
Distinct variable groups:   𝑗,𝑘,𝐴   𝑅,𝑗,𝑘   𝑆,𝑘
Allowed substitution hint:   𝑆(𝑗)

Proof of Theorem txlly
Dummy variables 𝑟 𝑠 𝑢 𝑣 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 llytop 21495 . . 3 (𝑅 ∈ Locally 𝐴𝑅 ∈ Top)
2 llytop 21495 . . 3 (𝑆 ∈ Locally 𝐴𝑆 ∈ Top)
3 txtop 21592 . . 3 ((𝑅 ∈ Top ∧ 𝑆 ∈ Top) → (𝑅 ×t 𝑆) ∈ Top)
41, 2, 3syl2an 575 . 2 ((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) → (𝑅 ×t 𝑆) ∈ Top)
5 eltx 21591 . . . 4 ((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) → (𝑥 ∈ (𝑅 ×t 𝑆) ↔ ∀𝑦𝑥𝑢𝑅𝑣𝑆 (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥)))
6 simpll 742 . . . . . . . . 9 (((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → 𝑅 ∈ Locally 𝐴)
7 simprll 756 . . . . . . . . 9 (((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → 𝑢𝑅)
8 simprrl 758 . . . . . . . . . 10 (((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → 𝑦 ∈ (𝑢 × 𝑣))
9 xp1st 7346 . . . . . . . . . 10 (𝑦 ∈ (𝑢 × 𝑣) → (1st𝑦) ∈ 𝑢)
108, 9syl 17 . . . . . . . . 9 (((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → (1st𝑦) ∈ 𝑢)
11 llyi 21497 . . . . . . . . 9 ((𝑅 ∈ Locally 𝐴𝑢𝑅 ∧ (1st𝑦) ∈ 𝑢) → ∃𝑟𝑅 (𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴))
126, 7, 10, 11syl3anc 1475 . . . . . . . 8 (((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → ∃𝑟𝑅 (𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴))
13 simplr 744 . . . . . . . . 9 (((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → 𝑆 ∈ Locally 𝐴)
14 simprlr 757 . . . . . . . . 9 (((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → 𝑣𝑆)
15 xp2nd 7347 . . . . . . . . . 10 (𝑦 ∈ (𝑢 × 𝑣) → (2nd𝑦) ∈ 𝑣)
168, 15syl 17 . . . . . . . . 9 (((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → (2nd𝑦) ∈ 𝑣)
17 llyi 21497 . . . . . . . . 9 ((𝑆 ∈ Locally 𝐴𝑣𝑆 ∧ (2nd𝑦) ∈ 𝑣) → ∃𝑠𝑆 (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴))
1813, 14, 16, 17syl3anc 1475 . . . . . . . 8 (((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → ∃𝑠𝑆 (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴))
19 reeanv 3254 . . . . . . . . 9 (∃𝑟𝑅𝑠𝑆 ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)) ↔ (∃𝑟𝑅 (𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ ∃𝑠𝑆 (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)))
201ad3antrrr 701 . . . . . . . . . . . . . 14 ((((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)))) → 𝑅 ∈ Top)
212ad3antlr 702 . . . . . . . . . . . . . 14 ((((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)))) → 𝑆 ∈ Top)
22 simprll 756 . . . . . . . . . . . . . 14 ((((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)))) → 𝑟𝑅)
23 simprlr 757 . . . . . . . . . . . . . 14 ((((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)))) → 𝑠𝑆)
24 txopn 21625 . . . . . . . . . . . . . 14 (((𝑅 ∈ Top ∧ 𝑆 ∈ Top) ∧ (𝑟𝑅𝑠𝑆)) → (𝑟 × 𝑠) ∈ (𝑅 ×t 𝑆))
2520, 21, 22, 23, 24syl22anc 1476 . . . . . . . . . . . . 13 ((((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)))) → (𝑟 × 𝑠) ∈ (𝑅 ×t 𝑆))
26 simprl1 1265 . . . . . . . . . . . . . . . 16 (((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴))) → 𝑟𝑢)
27 simprr1 1271 . . . . . . . . . . . . . . . 16 (((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴))) → 𝑠𝑣)
28 xpss12 5264 . . . . . . . . . . . . . . . 16 ((𝑟𝑢𝑠𝑣) → (𝑟 × 𝑠) ⊆ (𝑢 × 𝑣))
2926, 27, 28syl2anc 565 . . . . . . . . . . . . . . 15 (((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴))) → (𝑟 × 𝑠) ⊆ (𝑢 × 𝑣))
30 simprrr 759 . . . . . . . . . . . . . . 15 (((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → (𝑢 × 𝑣) ⊆ 𝑥)
3129, 30sylan9ssr 3764 . . . . . . . . . . . . . 14 ((((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)))) → (𝑟 × 𝑠) ⊆ 𝑥)
32 vex 3352 . . . . . . . . . . . . . . 15 𝑥 ∈ V
3332elpw2 4956 . . . . . . . . . . . . . 14 ((𝑟 × 𝑠) ∈ 𝒫 𝑥 ↔ (𝑟 × 𝑠) ⊆ 𝑥)
3431, 33sylibr 224 . . . . . . . . . . . . 13 ((((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)))) → (𝑟 × 𝑠) ∈ 𝒫 𝑥)
3525, 34elind 3947 . . . . . . . . . . . 12 ((((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)))) → (𝑟 × 𝑠) ∈ ((𝑅 ×t 𝑆) ∩ 𝒫 𝑥))
36 1st2nd2 7353 . . . . . . . . . . . . . . 15 (𝑦 ∈ (𝑢 × 𝑣) → 𝑦 = ⟨(1st𝑦), (2nd𝑦)⟩)
378, 36syl 17 . . . . . . . . . . . . . 14 (((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → 𝑦 = ⟨(1st𝑦), (2nd𝑦)⟩)
3837adantr 466 . . . . . . . . . . . . 13 ((((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)))) → 𝑦 = ⟨(1st𝑦), (2nd𝑦)⟩)
39 simprl2 1267 . . . . . . . . . . . . . . 15 (((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴))) → (1st𝑦) ∈ 𝑟)
40 simprr2 1273 . . . . . . . . . . . . . . 15 (((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴))) → (2nd𝑦) ∈ 𝑠)
41 opelxpi 5288 . . . . . . . . . . . . . . 15 (((1st𝑦) ∈ 𝑟 ∧ (2nd𝑦) ∈ 𝑠) → ⟨(1st𝑦), (2nd𝑦)⟩ ∈ (𝑟 × 𝑠))
4239, 40, 41syl2anc 565 . . . . . . . . . . . . . 14 (((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴))) → ⟨(1st𝑦), (2nd𝑦)⟩ ∈ (𝑟 × 𝑠))
4342adantl 467 . . . . . . . . . . . . 13 ((((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)))) → ⟨(1st𝑦), (2nd𝑦)⟩ ∈ (𝑟 × 𝑠))
4438, 43eqeltrd 2849 . . . . . . . . . . . 12 ((((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)))) → 𝑦 ∈ (𝑟 × 𝑠))
45 txrest 21654 . . . . . . . . . . . . . 14 (((𝑅 ∈ Top ∧ 𝑆 ∈ Top) ∧ (𝑟𝑅𝑠𝑆)) → ((𝑅 ×t 𝑆) ↾t (𝑟 × 𝑠)) = ((𝑅t 𝑟) ×t (𝑆t 𝑠)))
4620, 21, 22, 23, 45syl22anc 1476 . . . . . . . . . . . . 13 ((((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)))) → ((𝑅 ×t 𝑆) ↾t (𝑟 × 𝑠)) = ((𝑅t 𝑟) ×t (𝑆t 𝑠)))
47 simprl3 1269 . . . . . . . . . . . . . . 15 (((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴))) → (𝑅t 𝑟) ∈ 𝐴)
48 simprr3 1275 . . . . . . . . . . . . . . 15 (((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴))) → (𝑆t 𝑠) ∈ 𝐴)
49 txlly.1 . . . . . . . . . . . . . . . 16 ((𝑗𝐴𝑘𝐴) → (𝑗 ×t 𝑘) ∈ 𝐴)
5049caovcl 6974 . . . . . . . . . . . . . . 15 (((𝑅t 𝑟) ∈ 𝐴 ∧ (𝑆t 𝑠) ∈ 𝐴) → ((𝑅t 𝑟) ×t (𝑆t 𝑠)) ∈ 𝐴)
5147, 48, 50syl2anc 565 . . . . . . . . . . . . . 14 (((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴))) → ((𝑅t 𝑟) ×t (𝑆t 𝑠)) ∈ 𝐴)
5251adantl 467 . . . . . . . . . . . . 13 ((((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)))) → ((𝑅t 𝑟) ×t (𝑆t 𝑠)) ∈ 𝐴)
5346, 52eqeltrd 2849 . . . . . . . . . . . 12 ((((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)))) → ((𝑅 ×t 𝑆) ↾t (𝑟 × 𝑠)) ∈ 𝐴)
54 eleq2 2838 . . . . . . . . . . . . . 14 (𝑧 = (𝑟 × 𝑠) → (𝑦𝑧𝑦 ∈ (𝑟 × 𝑠)))
55 oveq2 6800 . . . . . . . . . . . . . . 15 (𝑧 = (𝑟 × 𝑠) → ((𝑅 ×t 𝑆) ↾t 𝑧) = ((𝑅 ×t 𝑆) ↾t (𝑟 × 𝑠)))
5655eleq1d 2834 . . . . . . . . . . . . . 14 (𝑧 = (𝑟 × 𝑠) → (((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴 ↔ ((𝑅 ×t 𝑆) ↾t (𝑟 × 𝑠)) ∈ 𝐴))
5754, 56anbi12d 608 . . . . . . . . . . . . 13 (𝑧 = (𝑟 × 𝑠) → ((𝑦𝑧 ∧ ((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴) ↔ (𝑦 ∈ (𝑟 × 𝑠) ∧ ((𝑅 ×t 𝑆) ↾t (𝑟 × 𝑠)) ∈ 𝐴)))
5857rspcev 3458 . . . . . . . . . . . 12 (((𝑟 × 𝑠) ∈ ((𝑅 ×t 𝑆) ∩ 𝒫 𝑥) ∧ (𝑦 ∈ (𝑟 × 𝑠) ∧ ((𝑅 ×t 𝑆) ↾t (𝑟 × 𝑠)) ∈ 𝐴)) → ∃𝑧 ∈ ((𝑅 ×t 𝑆) ∩ 𝒫 𝑥)(𝑦𝑧 ∧ ((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴))
5935, 44, 53, 58syl12anc 1473 . . . . . . . . . . 11 ((((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑟𝑅𝑠𝑆) ∧ ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)))) → ∃𝑧 ∈ ((𝑅 ×t 𝑆) ∩ 𝒫 𝑥)(𝑦𝑧 ∧ ((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴))
6059expr 444 . . . . . . . . . 10 ((((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ (𝑟𝑅𝑠𝑆)) → (((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)) → ∃𝑧 ∈ ((𝑅 ×t 𝑆) ∩ 𝒫 𝑥)(𝑦𝑧 ∧ ((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴)))
6160rexlimdvva 3185 . . . . . . . . 9 (((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → (∃𝑟𝑅𝑠𝑆 ((𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)) → ∃𝑧 ∈ ((𝑅 ×t 𝑆) ∩ 𝒫 𝑥)(𝑦𝑧 ∧ ((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴)))
6219, 61syl5bir 233 . . . . . . . 8 (((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → ((∃𝑟𝑅 (𝑟𝑢 ∧ (1st𝑦) ∈ 𝑟 ∧ (𝑅t 𝑟) ∈ 𝐴) ∧ ∃𝑠𝑆 (𝑠𝑣 ∧ (2nd𝑦) ∈ 𝑠 ∧ (𝑆t 𝑠) ∈ 𝐴)) → ∃𝑧 ∈ ((𝑅 ×t 𝑆) ∩ 𝒫 𝑥)(𝑦𝑧 ∧ ((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴)))
6312, 18, 62mp2and 671 . . . . . . 7 (((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → ∃𝑧 ∈ ((𝑅 ×t 𝑆) ∩ 𝒫 𝑥)(𝑦𝑧 ∧ ((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴))
6463expr 444 . . . . . 6 (((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) ∧ (𝑢𝑅𝑣𝑆)) → ((𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥) → ∃𝑧 ∈ ((𝑅 ×t 𝑆) ∩ 𝒫 𝑥)(𝑦𝑧 ∧ ((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴)))
6564rexlimdvva 3185 . . . . 5 ((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) → (∃𝑢𝑅𝑣𝑆 (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥) → ∃𝑧 ∈ ((𝑅 ×t 𝑆) ∩ 𝒫 𝑥)(𝑦𝑧 ∧ ((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴)))
6665ralimdv 3111 . . . 4 ((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) → (∀𝑦𝑥𝑢𝑅𝑣𝑆 (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥) → ∀𝑦𝑥𝑧 ∈ ((𝑅 ×t 𝑆) ∩ 𝒫 𝑥)(𝑦𝑧 ∧ ((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴)))
675, 66sylbid 230 . . 3 ((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) → (𝑥 ∈ (𝑅 ×t 𝑆) → ∀𝑦𝑥𝑧 ∈ ((𝑅 ×t 𝑆) ∩ 𝒫 𝑥)(𝑦𝑧 ∧ ((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴)))
6867ralrimiv 3113 . 2 ((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) → ∀𝑥 ∈ (𝑅 ×t 𝑆)∀𝑦𝑥𝑧 ∈ ((𝑅 ×t 𝑆) ∩ 𝒫 𝑥)(𝑦𝑧 ∧ ((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴))
69 islly 21491 . 2 ((𝑅 ×t 𝑆) ∈ Locally 𝐴 ↔ ((𝑅 ×t 𝑆) ∈ Top ∧ ∀𝑥 ∈ (𝑅 ×t 𝑆)∀𝑦𝑥𝑧 ∈ ((𝑅 ×t 𝑆) ∩ 𝒫 𝑥)(𝑦𝑧 ∧ ((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴)))
704, 68, 69sylanbrc 564 1 ((𝑅 ∈ Locally 𝐴𝑆 ∈ Locally 𝐴) → (𝑅 ×t 𝑆) ∈ Locally 𝐴)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 382   ∧ w3a 1070   = wceq 1630   ∈ wcel 2144  ∀wral 3060  ∃wrex 3061   ∩ cin 3720   ⊆ wss 3721  𝒫 cpw 4295  ⟨cop 4320   × cxp 5247  ‘cfv 6031  (class class class)co 6792  1st c1st 7312  2nd c2nd 7313   ↾t crest 16288  Topctop 20917  Locally clly 21487   ×t ctx 21583 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1869  ax-4 1884  ax-5 1990  ax-6 2056  ax-7 2092  ax-8 2146  ax-9 2153  ax-10 2173  ax-11 2189  ax-12 2202  ax-13 2407  ax-ext 2750  ax-rep 4902  ax-sep 4912  ax-nul 4920  ax-pow 4971  ax-pr 5034  ax-un 7095 This theorem depends on definitions:  df-bi 197  df-an 383  df-or 827  df-3an 1072  df-tru 1633  df-ex 1852  df-nf 1857  df-sb 2049  df-eu 2621  df-mo 2622  df-clab 2757  df-cleq 2763  df-clel 2766  df-nfc 2901  df-ne 2943  df-ral 3065  df-rex 3066  df-reu 3067  df-rab 3069  df-v 3351  df-sbc 3586  df-csb 3681  df-dif 3724  df-un 3726  df-in 3728  df-ss 3735  df-nul 4062  df-if 4224  df-pw 4297  df-sn 4315  df-pr 4317  df-op 4321  df-uni 4573  df-iun 4654  df-br 4785  df-opab 4845  df-mpt 4862  df-id 5157  df-xp 5255  df-rel 5256  df-cnv 5257  df-co 5258  df-dm 5259  df-rn 5260  df-res 5261  df-ima 5262  df-iota 5994  df-fun 6033  df-fn 6034  df-f 6035  df-f1 6036  df-fo 6037  df-f1o 6038  df-fv 6039  df-ov 6795  df-oprab 6796  df-mpt2 6797  df-1st 7314  df-2nd 7315  df-rest 16290  df-topgen 16311  df-top 20918  df-bases 20970  df-lly 21489  df-tx 21585 This theorem is referenced by: (None)
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