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Theorem tx1stc 21501
Description: The topological product of two first-countable spaces is first-countable. (Contributed by Mario Carneiro, 21-Mar-2015.)
Assertion
Ref Expression
tx1stc ((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) → (𝑅 ×t 𝑆) ∈ 1st𝜔)

Proof of Theorem tx1stc
Dummy variables 𝑎 𝑏 𝑚 𝑛 𝑝 𝑞 𝑟 𝑠 𝑢 𝑣 𝑤 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 1stctop 21294 . . 3 (𝑅 ∈ 1st𝜔 → 𝑅 ∈ Top)
2 1stctop 21294 . . 3 (𝑆 ∈ 1st𝜔 → 𝑆 ∈ Top)
3 txtop 21420 . . 3 ((𝑅 ∈ Top ∧ 𝑆 ∈ Top) → (𝑅 ×t 𝑆) ∈ Top)
41, 2, 3syl2an 493 . 2 ((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) → (𝑅 ×t 𝑆) ∈ Top)
5 eqid 2651 . . . . . . . 8 𝑅 = 𝑅
651stcclb 21295 . . . . . . 7 ((𝑅 ∈ 1st𝜔 ∧ 𝑢 𝑅) → ∃𝑎 ∈ 𝒫 𝑅(𝑎 ≼ ω ∧ ∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟))))
76ad2ant2r 798 . . . . . 6 (((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) → ∃𝑎 ∈ 𝒫 𝑅(𝑎 ≼ ω ∧ ∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟))))
8 eqid 2651 . . . . . . . 8 𝑆 = 𝑆
981stcclb 21295 . . . . . . 7 ((𝑆 ∈ 1st𝜔 ∧ 𝑣 𝑆) → ∃𝑏 ∈ 𝒫 𝑆(𝑏 ≼ ω ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))))
109ad2ant2l 797 . . . . . 6 (((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) → ∃𝑏 ∈ 𝒫 𝑆(𝑏 ≼ ω ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))))
11 reeanv 3136 . . . . . . 7 (∃𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆((𝑎 ≼ ω ∧ ∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟))) ∧ (𝑏 ≼ ω ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)))) ↔ (∃𝑎 ∈ 𝒫 𝑅(𝑎 ≼ ω ∧ ∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟))) ∧ ∃𝑏 ∈ 𝒫 𝑆(𝑏 ≼ ω ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)))))
12 an4 882 . . . . . . . . 9 (((𝑎 ≼ ω ∧ ∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟))) ∧ (𝑏 ≼ ω ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)))) ↔ ((𝑎 ≼ ω ∧ 𝑏 ≼ ω) ∧ (∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)))))
13 txopn 21453 . . . . . . . . . . . . . . . . . . 19 (((𝑅 ∈ Top ∧ 𝑆 ∈ Top) ∧ (𝑚𝑅𝑛𝑆)) → (𝑚 × 𝑛) ∈ (𝑅 ×t 𝑆))
1413ralrimivva 3000 . . . . . . . . . . . . . . . . . 18 ((𝑅 ∈ Top ∧ 𝑆 ∈ Top) → ∀𝑚𝑅𝑛𝑆 (𝑚 × 𝑛) ∈ (𝑅 ×t 𝑆))
151, 2, 14syl2an 493 . . . . . . . . . . . . . . . . 17 ((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) → ∀𝑚𝑅𝑛𝑆 (𝑚 × 𝑛) ∈ (𝑅 ×t 𝑆))
1615adantr 480 . . . . . . . . . . . . . . . 16 (((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) → ∀𝑚𝑅𝑛𝑆 (𝑚 × 𝑛) ∈ (𝑅 ×t 𝑆))
17 elpwi 4201 . . . . . . . . . . . . . . . . . 18 (𝑎 ∈ 𝒫 𝑅𝑎𝑅)
18 ssralv 3699 . . . . . . . . . . . . . . . . . 18 (𝑎𝑅 → (∀𝑚𝑅𝑛𝑆 (𝑚 × 𝑛) ∈ (𝑅 ×t 𝑆) → ∀𝑚𝑎𝑛𝑆 (𝑚 × 𝑛) ∈ (𝑅 ×t 𝑆)))
1917, 18syl 17 . . . . . . . . . . . . . . . . 17 (𝑎 ∈ 𝒫 𝑅 → (∀𝑚𝑅𝑛𝑆 (𝑚 × 𝑛) ∈ (𝑅 ×t 𝑆) → ∀𝑚𝑎𝑛𝑆 (𝑚 × 𝑛) ∈ (𝑅 ×t 𝑆)))
20 elpwi 4201 . . . . . . . . . . . . . . . . . . 19 (𝑏 ∈ 𝒫 𝑆𝑏𝑆)
21 ssralv 3699 . . . . . . . . . . . . . . . . . . 19 (𝑏𝑆 → (∀𝑛𝑆 (𝑚 × 𝑛) ∈ (𝑅 ×t 𝑆) → ∀𝑛𝑏 (𝑚 × 𝑛) ∈ (𝑅 ×t 𝑆)))
2220, 21syl 17 . . . . . . . . . . . . . . . . . 18 (𝑏 ∈ 𝒫 𝑆 → (∀𝑛𝑆 (𝑚 × 𝑛) ∈ (𝑅 ×t 𝑆) → ∀𝑛𝑏 (𝑚 × 𝑛) ∈ (𝑅 ×t 𝑆)))
2322ralimdv 2992 . . . . . . . . . . . . . . . . 17 (𝑏 ∈ 𝒫 𝑆 → (∀𝑚𝑎𝑛𝑆 (𝑚 × 𝑛) ∈ (𝑅 ×t 𝑆) → ∀𝑚𝑎𝑛𝑏 (𝑚 × 𝑛) ∈ (𝑅 ×t 𝑆)))
2419, 23sylan9 690 . . . . . . . . . . . . . . . 16 ((𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆) → (∀𝑚𝑅𝑛𝑆 (𝑚 × 𝑛) ∈ (𝑅 ×t 𝑆) → ∀𝑚𝑎𝑛𝑏 (𝑚 × 𝑛) ∈ (𝑅 ×t 𝑆)))
2516, 24mpan9 485 . . . . . . . . . . . . . . 15 ((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) → ∀𝑚𝑎𝑛𝑏 (𝑚 × 𝑛) ∈ (𝑅 ×t 𝑆))
26 eqid 2651 . . . . . . . . . . . . . . . 16 (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) = (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))
2726fmpt2 7282 . . . . . . . . . . . . . . 15 (∀𝑚𝑎𝑛𝑏 (𝑚 × 𝑛) ∈ (𝑅 ×t 𝑆) ↔ (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)):(𝑎 × 𝑏)⟶(𝑅 ×t 𝑆))
2825, 27sylib 208 . . . . . . . . . . . . . 14 ((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) → (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)):(𝑎 × 𝑏)⟶(𝑅 ×t 𝑆))
29 frn 6091 . . . . . . . . . . . . . 14 ((𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)):(𝑎 × 𝑏)⟶(𝑅 ×t 𝑆) → ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) ⊆ (𝑅 ×t 𝑆))
3028, 29syl 17 . . . . . . . . . . . . 13 ((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) → ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) ⊆ (𝑅 ×t 𝑆))
31 ovex 6718 . . . . . . . . . . . . . 14 (𝑅 ×t 𝑆) ∈ V
3231elpw2 4858 . . . . . . . . . . . . 13 (ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) ∈ 𝒫 (𝑅 ×t 𝑆) ↔ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) ⊆ (𝑅 ×t 𝑆))
3330, 32sylibr 224 . . . . . . . . . . . 12 ((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) → ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) ∈ 𝒫 (𝑅 ×t 𝑆))
3433adantr 480 . . . . . . . . . . 11 (((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ ((𝑎 ≼ ω ∧ 𝑏 ≼ ω) ∧ (∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))))) → ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) ∈ 𝒫 (𝑅 ×t 𝑆))
35 omelon 8581 . . . . . . . . . . . . . . 15 ω ∈ On
36 vex 3234 . . . . . . . . . . . . . . . . . 18 𝑏 ∈ V
3736xpdom1 8100 . . . . . . . . . . . . . . . . 17 (𝑎 ≼ ω → (𝑎 × 𝑏) ≼ (ω × 𝑏))
38 omex 8578 . . . . . . . . . . . . . . . . . 18 ω ∈ V
3938xpdom2 8096 . . . . . . . . . . . . . . . . 17 (𝑏 ≼ ω → (ω × 𝑏) ≼ (ω × ω))
40 domtr 8050 . . . . . . . . . . . . . . . . 17 (((𝑎 × 𝑏) ≼ (ω × 𝑏) ∧ (ω × 𝑏) ≼ (ω × ω)) → (𝑎 × 𝑏) ≼ (ω × ω))
4137, 39, 40syl2an 493 . . . . . . . . . . . . . . . 16 ((𝑎 ≼ ω ∧ 𝑏 ≼ ω) → (𝑎 × 𝑏) ≼ (ω × ω))
42 xpomen 8876 . . . . . . . . . . . . . . . 16 (ω × ω) ≈ ω
43 domentr 8056 . . . . . . . . . . . . . . . 16 (((𝑎 × 𝑏) ≼ (ω × ω) ∧ (ω × ω) ≈ ω) → (𝑎 × 𝑏) ≼ ω)
4441, 42, 43sylancl 695 . . . . . . . . . . . . . . 15 ((𝑎 ≼ ω ∧ 𝑏 ≼ ω) → (𝑎 × 𝑏) ≼ ω)
45 ondomen 8898 . . . . . . . . . . . . . . 15 ((ω ∈ On ∧ (𝑎 × 𝑏) ≼ ω) → (𝑎 × 𝑏) ∈ dom card)
4635, 44, 45sylancr 696 . . . . . . . . . . . . . 14 ((𝑎 ≼ ω ∧ 𝑏 ≼ ω) → (𝑎 × 𝑏) ∈ dom card)
47 vex 3234 . . . . . . . . . . . . . . . . 17 𝑚 ∈ V
48 vex 3234 . . . . . . . . . . . . . . . . 17 𝑛 ∈ V
4947, 48xpex 7004 . . . . . . . . . . . . . . . 16 (𝑚 × 𝑛) ∈ V
5026, 49fnmpt2i 7284 . . . . . . . . . . . . . . 15 (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) Fn (𝑎 × 𝑏)
51 dffn4 6159 . . . . . . . . . . . . . . 15 ((𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) Fn (𝑎 × 𝑏) ↔ (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)):(𝑎 × 𝑏)–onto→ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)))
5250, 51mpbi 220 . . . . . . . . . . . . . 14 (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)):(𝑎 × 𝑏)–onto→ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))
53 fodomnum 8918 . . . . . . . . . . . . . 14 ((𝑎 × 𝑏) ∈ dom card → ((𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)):(𝑎 × 𝑏)–onto→ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) → ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) ≼ (𝑎 × 𝑏)))
5446, 52, 53mpisyl 21 . . . . . . . . . . . . 13 ((𝑎 ≼ ω ∧ 𝑏 ≼ ω) → ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) ≼ (𝑎 × 𝑏))
55 domtr 8050 . . . . . . . . . . . . 13 ((ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) ≼ (𝑎 × 𝑏) ∧ (𝑎 × 𝑏) ≼ ω) → ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) ≼ ω)
5654, 44, 55syl2anc 694 . . . . . . . . . . . 12 ((𝑎 ≼ ω ∧ 𝑏 ≼ ω) → ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) ≼ ω)
5756ad2antrl 764 . . . . . . . . . . 11 (((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ ((𝑎 ≼ ω ∧ 𝑏 ≼ ω) ∧ (∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))))) → ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) ≼ ω)
581, 2anim12i 589 . . . . . . . . . . . . . . 15 ((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) → (𝑅 ∈ Top ∧ 𝑆 ∈ Top))
5958ad3antrrr 766 . . . . . . . . . . . . . 14 (((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ ((𝑎 ≼ ω ∧ 𝑏 ≼ ω) ∧ (∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))))) → (𝑅 ∈ Top ∧ 𝑆 ∈ Top))
60 eltx 21419 . . . . . . . . . . . . . 14 ((𝑅 ∈ Top ∧ 𝑆 ∈ Top) → (𝑧 ∈ (𝑅 ×t 𝑆) ↔ ∀𝑤𝑧𝑟𝑅𝑠𝑆 (𝑤 ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧)))
6159, 60syl 17 . . . . . . . . . . . . 13 (((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ ((𝑎 ≼ ω ∧ 𝑏 ≼ ω) ∧ (∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))))) → (𝑧 ∈ (𝑅 ×t 𝑆) ↔ ∀𝑤𝑧𝑟𝑅𝑠𝑆 (𝑤 ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧)))
62 eleq1 2718 . . . . . . . . . . . . . . . . 17 (𝑤 = ⟨𝑢, 𝑣⟩ → (𝑤 ∈ (𝑟 × 𝑠) ↔ ⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠)))
6362anbi1d 741 . . . . . . . . . . . . . . . 16 (𝑤 = ⟨𝑢, 𝑣⟩ → ((𝑤 ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧) ↔ (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧)))
64632rexbidv 3086 . . . . . . . . . . . . . . 15 (𝑤 = ⟨𝑢, 𝑣⟩ → (∃𝑟𝑅𝑠𝑆 (𝑤 ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧) ↔ ∃𝑟𝑅𝑠𝑆 (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧)))
6564rspccv 3337 . . . . . . . . . . . . . 14 (∀𝑤𝑧𝑟𝑅𝑠𝑆 (𝑤 ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧) → (⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑟𝑅𝑠𝑆 (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧)))
66 r19.27v 3099 . . . . . . . . . . . . . . . . . 18 ((∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))) → ∀𝑟𝑅 ((𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))))
67 r19.29 3101 . . . . . . . . . . . . . . . . . . 19 ((∀𝑟𝑅 ((𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))) ∧ ∃𝑟𝑅𝑠𝑆 (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → ∃𝑟𝑅 (((𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))) ∧ ∃𝑠𝑆 (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧)))
68 r19.29 3101 . . . . . . . . . . . . . . . . . . . . . 22 ((∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)) ∧ ∃𝑠𝑆 (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → ∃𝑠𝑆 ((𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)) ∧ (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧)))
69 opelxp 5180 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ↔ (𝑢𝑟𝑣𝑠))
70 pm3.35 610 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ((𝑢𝑟 ∧ (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟))) → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟))
71 pm3.35 610 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ((𝑣𝑠 ∧ (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))) → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))
7270, 71anim12i 589 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (((𝑢𝑟 ∧ (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟))) ∧ (𝑣𝑠 ∧ (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)))) → (∃𝑝𝑎 (𝑢𝑝𝑝𝑟) ∧ ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)))
7372an4s 886 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (((𝑢𝑟𝑣𝑠) ∧ ((𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)))) → (∃𝑝𝑎 (𝑢𝑝𝑝𝑟) ∧ ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)))
7469, 73sylanb 488 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 ((⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ ((𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)))) → (∃𝑝𝑎 (𝑢𝑝𝑝𝑟) ∧ ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)))
7574anim1i 591 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (((⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ ((𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)))) ∧ (𝑟 × 𝑠) ⊆ 𝑧) → ((∃𝑝𝑎 (𝑢𝑝𝑝𝑟) ∧ ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧))
7675anasss 680 . . . . . . . . . . . . . . . . . . . . . . . . 25 ((⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (((𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → ((∃𝑝𝑎 (𝑢𝑝𝑝𝑟) ∧ ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧))
7776an12s 860 . . . . . . . . . . . . . . . . . . . . . . . 24 ((((𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))) ∧ (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → ((∃𝑝𝑎 (𝑢𝑝𝑝𝑟) ∧ ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧))
7877expl 647 . . . . . . . . . . . . . . . . . . . . . . 23 ((𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) → (((𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)) ∧ (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → ((∃𝑝𝑎 (𝑢𝑝𝑝𝑟) ∧ ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧)))
7978reximdv 3045 . . . . . . . . . . . . . . . . . . . . . 22 ((𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) → (∃𝑠𝑆 ((𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)) ∧ (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → ∃𝑠𝑆 ((∃𝑝𝑎 (𝑢𝑝𝑝𝑟) ∧ ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧)))
8068, 79syl5 34 . . . . . . . . . . . . . . . . . . . . 21 ((𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) → ((∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)) ∧ ∃𝑠𝑆 (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → ∃𝑠𝑆 ((∃𝑝𝑎 (𝑢𝑝𝑝𝑟) ∧ ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧)))
8180impl 649 . . . . . . . . . . . . . . . . . . . 20 ((((𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))) ∧ ∃𝑠𝑆 (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → ∃𝑠𝑆 ((∃𝑝𝑎 (𝑢𝑝𝑝𝑟) ∧ ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧))
8281reximi 3040 . . . . . . . . . . . . . . . . . . 19 (∃𝑟𝑅 (((𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))) ∧ ∃𝑠𝑆 (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → ∃𝑟𝑅𝑠𝑆 ((∃𝑝𝑎 (𝑢𝑝𝑝𝑟) ∧ ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧))
8367, 82syl 17 . . . . . . . . . . . . . . . . . 18 ((∀𝑟𝑅 ((𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))) ∧ ∃𝑟𝑅𝑠𝑆 (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → ∃𝑟𝑅𝑠𝑆 ((∃𝑝𝑎 (𝑢𝑝𝑝𝑟) ∧ ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧))
8466, 83sylan 487 . . . . . . . . . . . . . . . . 17 (((∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))) ∧ ∃𝑟𝑅𝑠𝑆 (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → ∃𝑟𝑅𝑠𝑆 ((∃𝑝𝑎 (𝑢𝑝𝑝𝑟) ∧ ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧))
85 reeanv 3136 . . . . . . . . . . . . . . . . . . . 20 (∃𝑝𝑎𝑞𝑏 ((𝑢𝑝𝑝𝑟) ∧ (𝑣𝑞𝑞𝑠)) ↔ (∃𝑝𝑎 (𝑢𝑝𝑝𝑟) ∧ ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)))
86 simpr1l 1138 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (((((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) ∧ (𝑟𝑅𝑠𝑆)) ∧ ((𝑝𝑎𝑞𝑏) ∧ ((𝑢𝑝𝑝𝑟) ∧ (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → 𝑝𝑎)
87 simpr1r 1139 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (((((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) ∧ (𝑟𝑅𝑠𝑆)) ∧ ((𝑝𝑎𝑞𝑏) ∧ ((𝑢𝑝𝑝𝑟) ∧ (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → 𝑞𝑏)
88 eqidd 2652 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (((((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) ∧ (𝑟𝑅𝑠𝑆)) ∧ ((𝑝𝑎𝑞𝑏) ∧ ((𝑢𝑝𝑝𝑟) ∧ (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → (𝑝 × 𝑞) = (𝑝 × 𝑞))
89 xpeq1 5157 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (𝑚 = 𝑝 → (𝑚 × 𝑛) = (𝑝 × 𝑛))
9089eqeq2d 2661 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 (𝑚 = 𝑝 → ((𝑝 × 𝑞) = (𝑚 × 𝑛) ↔ (𝑝 × 𝑞) = (𝑝 × 𝑛)))
91 xpeq2 5163 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (𝑛 = 𝑞 → (𝑝 × 𝑛) = (𝑝 × 𝑞))
9291eqeq2d 2661 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 (𝑛 = 𝑞 → ((𝑝 × 𝑞) = (𝑝 × 𝑛) ↔ (𝑝 × 𝑞) = (𝑝 × 𝑞)))
9390, 92rspc2ev 3355 . . . . . . . . . . . . . . . . . . . . . . . . . 26 ((𝑝𝑎𝑞𝑏 ∧ (𝑝 × 𝑞) = (𝑝 × 𝑞)) → ∃𝑚𝑎𝑛𝑏 (𝑝 × 𝑞) = (𝑚 × 𝑛))
9486, 87, 88, 93syl3anc 1366 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) ∧ (𝑟𝑅𝑠𝑆)) ∧ ((𝑝𝑎𝑞𝑏) ∧ ((𝑢𝑝𝑝𝑟) ∧ (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → ∃𝑚𝑎𝑛𝑏 (𝑝 × 𝑞) = (𝑚 × 𝑛))
95 vex 3234 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 𝑝 ∈ V
96 vex 3234 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 𝑞 ∈ V
9795, 96xpex 7004 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (𝑝 × 𝑞) ∈ V
98 eqeq1 2655 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 (𝑥 = (𝑝 × 𝑞) → (𝑥 = (𝑚 × 𝑛) ↔ (𝑝 × 𝑞) = (𝑚 × 𝑛)))
99982rexbidv 3086 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (𝑥 = (𝑝 × 𝑞) → (∃𝑚𝑎𝑛𝑏 𝑥 = (𝑚 × 𝑛) ↔ ∃𝑚𝑎𝑛𝑏 (𝑝 × 𝑞) = (𝑚 × 𝑛)))
10097, 99elab 3382 . . . . . . . . . . . . . . . . . . . . . . . . 25 ((𝑝 × 𝑞) ∈ {𝑥 ∣ ∃𝑚𝑎𝑛𝑏 𝑥 = (𝑚 × 𝑛)} ↔ ∃𝑚𝑎𝑛𝑏 (𝑝 × 𝑞) = (𝑚 × 𝑛))
10194, 100sylibr 224 . . . . . . . . . . . . . . . . . . . . . . . 24 (((((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) ∧ (𝑟𝑅𝑠𝑆)) ∧ ((𝑝𝑎𝑞𝑏) ∧ ((𝑢𝑝𝑝𝑟) ∧ (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → (𝑝 × 𝑞) ∈ {𝑥 ∣ ∃𝑚𝑎𝑛𝑏 𝑥 = (𝑚 × 𝑛)})
10226rnmpt2 6812 . . . . . . . . . . . . . . . . . . . . . . . 24 ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) = {𝑥 ∣ ∃𝑚𝑎𝑛𝑏 𝑥 = (𝑚 × 𝑛)}
103101, 102syl6eleqr 2741 . . . . . . . . . . . . . . . . . . . . . . 23 (((((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) ∧ (𝑟𝑅𝑠𝑆)) ∧ ((𝑝𝑎𝑞𝑏) ∧ ((𝑢𝑝𝑝𝑟) ∧ (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → (𝑝 × 𝑞) ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)))
104 simpr2 1088 . . . . . . . . . . . . . . . . . . . . . . . 24 (((((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) ∧ (𝑟𝑅𝑠𝑆)) ∧ ((𝑝𝑎𝑞𝑏) ∧ ((𝑢𝑝𝑝𝑟) ∧ (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → ((𝑢𝑝𝑝𝑟) ∧ (𝑣𝑞𝑞𝑠)))
105 opelxpi 5182 . . . . . . . . . . . . . . . . . . . . . . . . 25 ((𝑢𝑝𝑣𝑞) → ⟨𝑢, 𝑣⟩ ∈ (𝑝 × 𝑞))
106105ad2ant2r 798 . . . . . . . . . . . . . . . . . . . . . . . 24 (((𝑢𝑝𝑝𝑟) ∧ (𝑣𝑞𝑞𝑠)) → ⟨𝑢, 𝑣⟩ ∈ (𝑝 × 𝑞))
107104, 106syl 17 . . . . . . . . . . . . . . . . . . . . . . 23 (((((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) ∧ (𝑟𝑅𝑠𝑆)) ∧ ((𝑝𝑎𝑞𝑏) ∧ ((𝑢𝑝𝑝𝑟) ∧ (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → ⟨𝑢, 𝑣⟩ ∈ (𝑝 × 𝑞))
108 xpss12 5158 . . . . . . . . . . . . . . . . . . . . . . . . . 26 ((𝑝𝑟𝑞𝑠) → (𝑝 × 𝑞) ⊆ (𝑟 × 𝑠))
109108ad2ant2l 797 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((𝑢𝑝𝑝𝑟) ∧ (𝑣𝑞𝑞𝑠)) → (𝑝 × 𝑞) ⊆ (𝑟 × 𝑠))
110104, 109syl 17 . . . . . . . . . . . . . . . . . . . . . . . 24 (((((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) ∧ (𝑟𝑅𝑠𝑆)) ∧ ((𝑝𝑎𝑞𝑏) ∧ ((𝑢𝑝𝑝𝑟) ∧ (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → (𝑝 × 𝑞) ⊆ (𝑟 × 𝑠))
111 simpr3 1089 . . . . . . . . . . . . . . . . . . . . . . . 24 (((((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) ∧ (𝑟𝑅𝑠𝑆)) ∧ ((𝑝𝑎𝑞𝑏) ∧ ((𝑢𝑝𝑝𝑟) ∧ (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → (𝑟 × 𝑠) ⊆ 𝑧)
112110, 111sstrd 3646 . . . . . . . . . . . . . . . . . . . . . . 23 (((((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) ∧ (𝑟𝑅𝑠𝑆)) ∧ ((𝑝𝑎𝑞𝑏) ∧ ((𝑢𝑝𝑝𝑟) ∧ (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → (𝑝 × 𝑞) ⊆ 𝑧)
113 eleq2 2719 . . . . . . . . . . . . . . . . . . . . . . . . 25 (𝑤 = (𝑝 × 𝑞) → (⟨𝑢, 𝑣⟩ ∈ 𝑤 ↔ ⟨𝑢, 𝑣⟩ ∈ (𝑝 × 𝑞)))
114 sseq1 3659 . . . . . . . . . . . . . . . . . . . . . . . . 25 (𝑤 = (𝑝 × 𝑞) → (𝑤𝑧 ↔ (𝑝 × 𝑞) ⊆ 𝑧))
115113, 114anbi12d 747 . . . . . . . . . . . . . . . . . . . . . . . 24 (𝑤 = (𝑝 × 𝑞) → ((⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧) ↔ (⟨𝑢, 𝑣⟩ ∈ (𝑝 × 𝑞) ∧ (𝑝 × 𝑞) ⊆ 𝑧)))
116115rspcev 3340 . . . . . . . . . . . . . . . . . . . . . . 23 (((𝑝 × 𝑞) ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) ∧ (⟨𝑢, 𝑣⟩ ∈ (𝑝 × 𝑞) ∧ (𝑝 × 𝑞) ⊆ 𝑧)) → ∃𝑤 ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))(⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧))
117103, 107, 112, 116syl12anc 1364 . . . . . . . . . . . . . . . . . . . . . 22 (((((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) ∧ (𝑟𝑅𝑠𝑆)) ∧ ((𝑝𝑎𝑞𝑏) ∧ ((𝑢𝑝𝑝𝑟) ∧ (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → ∃𝑤 ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))(⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧))
1181173exp2 1307 . . . . . . . . . . . . . . . . . . . . 21 ((((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) ∧ (𝑟𝑅𝑠𝑆)) → ((𝑝𝑎𝑞𝑏) → (((𝑢𝑝𝑝𝑟) ∧ (𝑣𝑞𝑞𝑠)) → ((𝑟 × 𝑠) ⊆ 𝑧 → ∃𝑤 ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))(⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)))))
119118rexlimdvv 3066 . . . . . . . . . . . . . . . . . . . 20 ((((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) ∧ (𝑟𝑅𝑠𝑆)) → (∃𝑝𝑎𝑞𝑏 ((𝑢𝑝𝑝𝑟) ∧ (𝑣𝑞𝑞𝑠)) → ((𝑟 × 𝑠) ⊆ 𝑧 → ∃𝑤 ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))(⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧))))
12085, 119syl5bir 233 . . . . . . . . . . . . . . . . . . 19 ((((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) ∧ (𝑟𝑅𝑠𝑆)) → ((∃𝑝𝑎 (𝑢𝑝𝑝𝑟) ∧ ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)) → ((𝑟 × 𝑠) ⊆ 𝑧 → ∃𝑤 ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))(⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧))))
121120impd 446 . . . . . . . . . . . . . . . . . 18 ((((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) ∧ (𝑟𝑅𝑠𝑆)) → (((∃𝑝𝑎 (𝑢𝑝𝑝𝑟) ∧ ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧) → ∃𝑤 ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))(⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)))
122121rexlimdvva 3067 . . . . . . . . . . . . . . . . 17 (((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) → (∃𝑟𝑅𝑠𝑆 ((∃𝑝𝑎 (𝑢𝑝𝑝𝑟) ∧ ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)) ∧ (𝑟 × 𝑠) ⊆ 𝑧) → ∃𝑤 ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))(⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)))
12384, 122syl5 34 . . . . . . . . . . . . . . . 16 (((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) → (((∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))) ∧ ∃𝑟𝑅𝑠𝑆 (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧)) → ∃𝑤 ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))(⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)))
124123expd 451 . . . . . . . . . . . . . . 15 (((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ (𝑎 ≼ ω ∧ 𝑏 ≼ ω)) → ((∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))) → (∃𝑟𝑅𝑠𝑆 (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧) → ∃𝑤 ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))(⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧))))
125124impr 648 . . . . . . . . . . . . . 14 (((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ ((𝑎 ≼ ω ∧ 𝑏 ≼ ω) ∧ (∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))))) → (∃𝑟𝑅𝑠𝑆 (⟨𝑢, 𝑣⟩ ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧) → ∃𝑤 ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))(⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)))
12665, 125syl9r 78 . . . . . . . . . . . . 13 (((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ ((𝑎 ≼ ω ∧ 𝑏 ≼ ω) ∧ (∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))))) → (∀𝑤𝑧𝑟𝑅𝑠𝑆 (𝑤 ∈ (𝑟 × 𝑠) ∧ (𝑟 × 𝑠) ⊆ 𝑧) → (⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤 ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))(⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧))))
12761, 126sylbid 230 . . . . . . . . . . . 12 (((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ ((𝑎 ≼ ω ∧ 𝑏 ≼ ω) ∧ (∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))))) → (𝑧 ∈ (𝑅 ×t 𝑆) → (⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤 ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))(⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧))))
128127ralrimiv 2994 . . . . . . . . . . 11 (((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ ((𝑎 ≼ ω ∧ 𝑏 ≼ ω) ∧ (∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))))) → ∀𝑧 ∈ (𝑅 ×t 𝑆)(⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤 ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))(⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)))
129 breq1 4688 . . . . . . . . . . . . 13 (𝑦 = ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) → (𝑦 ≼ ω ↔ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) ≼ ω))
130 rexeq 3169 . . . . . . . . . . . . . . 15 (𝑦 = ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) → (∃𝑤𝑦 (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧) ↔ ∃𝑤 ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))(⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)))
131130imbi2d 329 . . . . . . . . . . . . . 14 (𝑦 = ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) → ((⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤𝑦 (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)) ↔ (⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤 ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))(⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧))))
132131ralbidv 3015 . . . . . . . . . . . . 13 (𝑦 = ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) → (∀𝑧 ∈ (𝑅 ×t 𝑆)(⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤𝑦 (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)) ↔ ∀𝑧 ∈ (𝑅 ×t 𝑆)(⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤 ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))(⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧))))
133129, 132anbi12d 747 . . . . . . . . . . . 12 (𝑦 = ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) → ((𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤𝑦 (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧))) ↔ (ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤 ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))(⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)))))
134133rspcev 3340 . . . . . . . . . . 11 ((ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) ∈ 𝒫 (𝑅 ×t 𝑆) ∧ (ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛)) ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤 ∈ ran (𝑚𝑎, 𝑛𝑏 ↦ (𝑚 × 𝑛))(⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)))) → ∃𝑦 ∈ 𝒫 (𝑅 ×t 𝑆)(𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤𝑦 (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧))))
13534, 57, 128, 134syl12anc 1364 . . . . . . . . . 10 (((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) ∧ ((𝑎 ≼ ω ∧ 𝑏 ≼ ω) ∧ (∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠))))) → ∃𝑦 ∈ 𝒫 (𝑅 ×t 𝑆)(𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤𝑦 (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧))))
136135ex 449 . . . . . . . . 9 ((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) → (((𝑎 ≼ ω ∧ 𝑏 ≼ ω) ∧ (∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟)) ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)))) → ∃𝑦 ∈ 𝒫 (𝑅 ×t 𝑆)(𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤𝑦 (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)))))
13712, 136syl5bi 232 . . . . . . . 8 ((((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) ∧ (𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆)) → (((𝑎 ≼ ω ∧ ∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟))) ∧ (𝑏 ≼ ω ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)))) → ∃𝑦 ∈ 𝒫 (𝑅 ×t 𝑆)(𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤𝑦 (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)))))
138137rexlimdvva 3067 . . . . . . 7 (((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) → (∃𝑎 ∈ 𝒫 𝑅𝑏 ∈ 𝒫 𝑆((𝑎 ≼ ω ∧ ∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟))) ∧ (𝑏 ≼ ω ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)))) → ∃𝑦 ∈ 𝒫 (𝑅 ×t 𝑆)(𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤𝑦 (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)))))
13911, 138syl5bir 233 . . . . . 6 (((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) → ((∃𝑎 ∈ 𝒫 𝑅(𝑎 ≼ ω ∧ ∀𝑟𝑅 (𝑢𝑟 → ∃𝑝𝑎 (𝑢𝑝𝑝𝑟))) ∧ ∃𝑏 ∈ 𝒫 𝑆(𝑏 ≼ ω ∧ ∀𝑠𝑆 (𝑣𝑠 → ∃𝑞𝑏 (𝑣𝑞𝑞𝑠)))) → ∃𝑦 ∈ 𝒫 (𝑅 ×t 𝑆)(𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤𝑦 (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)))))
1407, 10, 139mp2and 715 . . . . 5 (((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) ∧ (𝑢 𝑅𝑣 𝑆)) → ∃𝑦 ∈ 𝒫 (𝑅 ×t 𝑆)(𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤𝑦 (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧))))
141140ralrimivva 3000 . . . 4 ((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) → ∀𝑢 𝑅𝑣 𝑆𝑦 ∈ 𝒫 (𝑅 ×t 𝑆)(𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤𝑦 (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧))))
142 eleq1 2718 . . . . . . . . 9 (𝑥 = ⟨𝑢, 𝑣⟩ → (𝑥𝑧 ↔ ⟨𝑢, 𝑣⟩ ∈ 𝑧))
143 eleq1 2718 . . . . . . . . . . 11 (𝑥 = ⟨𝑢, 𝑣⟩ → (𝑥𝑤 ↔ ⟨𝑢, 𝑣⟩ ∈ 𝑤))
144143anbi1d 741 . . . . . . . . . 10 (𝑥 = ⟨𝑢, 𝑣⟩ → ((𝑥𝑤𝑤𝑧) ↔ (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)))
145144rexbidv 3081 . . . . . . . . 9 (𝑥 = ⟨𝑢, 𝑣⟩ → (∃𝑤𝑦 (𝑥𝑤𝑤𝑧) ↔ ∃𝑤𝑦 (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)))
146142, 145imbi12d 333 . . . . . . . 8 (𝑥 = ⟨𝑢, 𝑣⟩ → ((𝑥𝑧 → ∃𝑤𝑦 (𝑥𝑤𝑤𝑧)) ↔ (⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤𝑦 (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧))))
147146ralbidv 3015 . . . . . . 7 (𝑥 = ⟨𝑢, 𝑣⟩ → (∀𝑧 ∈ (𝑅 ×t 𝑆)(𝑥𝑧 → ∃𝑤𝑦 (𝑥𝑤𝑤𝑧)) ↔ ∀𝑧 ∈ (𝑅 ×t 𝑆)(⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤𝑦 (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧))))
148147anbi2d 740 . . . . . 6 (𝑥 = ⟨𝑢, 𝑣⟩ → ((𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(𝑥𝑧 → ∃𝑤𝑦 (𝑥𝑤𝑤𝑧))) ↔ (𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤𝑦 (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)))))
149148rexbidv 3081 . . . . 5 (𝑥 = ⟨𝑢, 𝑣⟩ → (∃𝑦 ∈ 𝒫 (𝑅 ×t 𝑆)(𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(𝑥𝑧 → ∃𝑤𝑦 (𝑥𝑤𝑤𝑧))) ↔ ∃𝑦 ∈ 𝒫 (𝑅 ×t 𝑆)(𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤𝑦 (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧)))))
150149ralxp 5296 . . . 4 (∀𝑥 ∈ ( 𝑅 × 𝑆)∃𝑦 ∈ 𝒫 (𝑅 ×t 𝑆)(𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(𝑥𝑧 → ∃𝑤𝑦 (𝑥𝑤𝑤𝑧))) ↔ ∀𝑢 𝑅𝑣 𝑆𝑦 ∈ 𝒫 (𝑅 ×t 𝑆)(𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(⟨𝑢, 𝑣⟩ ∈ 𝑧 → ∃𝑤𝑦 (⟨𝑢, 𝑣⟩ ∈ 𝑤𝑤𝑧))))
151141, 150sylibr 224 . . 3 ((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) → ∀𝑥 ∈ ( 𝑅 × 𝑆)∃𝑦 ∈ 𝒫 (𝑅 ×t 𝑆)(𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(𝑥𝑧 → ∃𝑤𝑦 (𝑥𝑤𝑤𝑧))))
1525, 8txuni 21443 . . . . 5 ((𝑅 ∈ Top ∧ 𝑆 ∈ Top) → ( 𝑅 × 𝑆) = (𝑅 ×t 𝑆))
1531, 2, 152syl2an 493 . . . 4 ((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) → ( 𝑅 × 𝑆) = (𝑅 ×t 𝑆))
154153raleqdv 3174 . . 3 ((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) → (∀𝑥 ∈ ( 𝑅 × 𝑆)∃𝑦 ∈ 𝒫 (𝑅 ×t 𝑆)(𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(𝑥𝑧 → ∃𝑤𝑦 (𝑥𝑤𝑤𝑧))) ↔ ∀𝑥 (𝑅 ×t 𝑆)∃𝑦 ∈ 𝒫 (𝑅 ×t 𝑆)(𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(𝑥𝑧 → ∃𝑤𝑦 (𝑥𝑤𝑤𝑧)))))
155151, 154mpbid 222 . 2 ((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) → ∀𝑥 (𝑅 ×t 𝑆)∃𝑦 ∈ 𝒫 (𝑅 ×t 𝑆)(𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(𝑥𝑧 → ∃𝑤𝑦 (𝑥𝑤𝑤𝑧))))
156 eqid 2651 . . 3 (𝑅 ×t 𝑆) = (𝑅 ×t 𝑆)
157156is1stc2 21293 . 2 ((𝑅 ×t 𝑆) ∈ 1st𝜔 ↔ ((𝑅 ×t 𝑆) ∈ Top ∧ ∀𝑥 (𝑅 ×t 𝑆)∃𝑦 ∈ 𝒫 (𝑅 ×t 𝑆)(𝑦 ≼ ω ∧ ∀𝑧 ∈ (𝑅 ×t 𝑆)(𝑥𝑧 → ∃𝑤𝑦 (𝑥𝑤𝑤𝑧)))))
1584, 155, 157sylanbrc 699 1 ((𝑅 ∈ 1st𝜔 ∧ 𝑆 ∈ 1st𝜔) → (𝑅 ×t 𝑆) ∈ 1st𝜔)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 383  w3a 1054   = wceq 1523  wcel 2030  {cab 2637  wral 2941  wrex 2942  wss 3607  𝒫 cpw 4191  cop 4216   cuni 4468   class class class wbr 4685   × cxp 5141  dom cdm 5143  ran crn 5144  Oncon0 5761   Fn wfn 5921  wf 5922  ontowfo 5924  (class class class)co 6690  cmpt2 6692  ωcom 7107  cen 7994  cdom 7995  cardccrd 8799  Topctop 20746  1st𝜔c1stc 21288   ×t ctx 21411
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-rep 4804  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991  ax-inf2 8576
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-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-pss 3623  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-tp 4215  df-op 4217  df-uni 4469  df-int 4508  df-iun 4554  df-br 4686  df-opab 4746  df-mpt 4763  df-tr 4786  df-id 5053  df-eprel 5058  df-po 5064  df-so 5065  df-fr 5102  df-se 5103  df-we 5104  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-pred 5718  df-ord 5764  df-on 5765  df-lim 5766  df-suc 5767  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-isom 5935  df-riota 6651  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-om 7108  df-1st 7210  df-2nd 7211  df-wrecs 7452  df-recs 7513  df-rdg 7551  df-1o 7605  df-oadd 7609  df-er 7787  df-map 7901  df-en 7998  df-dom 7999  df-sdom 8000  df-fin 8001  df-oi 8456  df-card 8803  df-acn 8806  df-topgen 16151  df-top 20747  df-topon 20764  df-bases 20798  df-1stc 21290  df-tx 21413
This theorem is referenced by: (None)
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