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Theorem txnlly 21634
 Description: If the property 𝐴 is preserved under topological products, then so is the property of being n-locally 𝐴. (Contributed by Mario Carneiro, 13-Apr-2015.)
Hypothesis
Ref Expression
txlly.1 ((𝑗𝐴𝑘𝐴) → (𝑗 ×t 𝑘) ∈ 𝐴)
Assertion
Ref Expression
txnlly ((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) → (𝑅 ×t 𝑆) ∈ 𝑛-Locally 𝐴)
Distinct variable groups:   𝑗,𝑘,𝐴   𝑅,𝑗,𝑘   𝑆,𝑘
Allowed substitution hint:   𝑆(𝑗)

Proof of Theorem txnlly
Dummy variables 𝑎 𝑏 𝑟 𝑠 𝑢 𝑣 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 nllytop 21470 . . 3 (𝑅 ∈ 𝑛-Locally 𝐴𝑅 ∈ Top)
2 nllytop 21470 . . 3 (𝑆 ∈ 𝑛-Locally 𝐴𝑆 ∈ Top)
3 txtop 21566 . . 3 ((𝑅 ∈ Top ∧ 𝑆 ∈ Top) → (𝑅 ×t 𝑆) ∈ Top)
41, 2, 3syl2an 495 . 2 ((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) → (𝑅 ×t 𝑆) ∈ Top)
5 eltx 21565 . . . 4 ((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) → (𝑥 ∈ (𝑅 ×t 𝑆) ↔ ∀𝑦𝑥𝑢𝑅𝑣𝑆 (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥)))
6 simpll 807 . . . . . . . . 9 (((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → 𝑅 ∈ 𝑛-Locally 𝐴)
7 simprll 821 . . . . . . . . 9 (((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → 𝑢𝑅)
8 simprrl 823 . . . . . . . . . 10 (((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → 𝑦 ∈ (𝑢 × 𝑣))
9 xp1st 7357 . . . . . . . . . 10 (𝑦 ∈ (𝑢 × 𝑣) → (1st𝑦) ∈ 𝑢)
108, 9syl 17 . . . . . . . . 9 (((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → (1st𝑦) ∈ 𝑢)
11 nlly2i 21473 . . . . . . . . 9 ((𝑅 ∈ 𝑛-Locally 𝐴𝑢𝑅 ∧ (1st𝑦) ∈ 𝑢) → ∃𝑎 ∈ 𝒫 𝑢𝑟𝑅 ((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴))
126, 7, 10, 11syl3anc 1473 . . . . . . . 8 (((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → ∃𝑎 ∈ 𝒫 𝑢𝑟𝑅 ((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴))
13 simplr 809 . . . . . . . . 9 (((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → 𝑆 ∈ 𝑛-Locally 𝐴)
14 simprlr 822 . . . . . . . . 9 (((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → 𝑣𝑆)
15 xp2nd 7358 . . . . . . . . . 10 (𝑦 ∈ (𝑢 × 𝑣) → (2nd𝑦) ∈ 𝑣)
168, 15syl 17 . . . . . . . . 9 (((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → (2nd𝑦) ∈ 𝑣)
17 nlly2i 21473 . . . . . . . . 9 ((𝑆 ∈ 𝑛-Locally 𝐴𝑣𝑆 ∧ (2nd𝑦) ∈ 𝑣) → ∃𝑏 ∈ 𝒫 𝑣𝑠𝑆 ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))
1813, 14, 16, 17syl3anc 1473 . . . . . . . 8 (((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → ∃𝑏 ∈ 𝒫 𝑣𝑠𝑆 ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))
19 reeanv 3237 . . . . . . . . 9 (∃𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣(∃𝑟𝑅 ((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ∃𝑠𝑆 ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴)) ↔ (∃𝑎 ∈ 𝒫 𝑢𝑟𝑅 ((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ∃𝑏 ∈ 𝒫 𝑣𝑠𝑆 ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴)))
20 reeanv 3237 . . . . . . . . . . 11 (∃𝑟𝑅𝑠𝑆 (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴)) ↔ (∃𝑟𝑅 ((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ∃𝑠𝑆 ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴)))
214ad3antrrr 768 . . . . . . . . . . . . . . . . 17 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → (𝑅 ×t 𝑆) ∈ Top)
221ad2antrr 764 . . . . . . . . . . . . . . . . . . . 20 (((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → 𝑅 ∈ Top)
2322ad2antrr 764 . . . . . . . . . . . . . . . . . . 19 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑅 ∈ Top)
2413, 2syl 17 . . . . . . . . . . . . . . . . . . . 20 (((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → 𝑆 ∈ Top)
2524ad2antrr 764 . . . . . . . . . . . . . . . . . . 19 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑆 ∈ Top)
26 simprrl 823 . . . . . . . . . . . . . . . . . . . 20 ((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) → 𝑟𝑅)
2726adantr 472 . . . . . . . . . . . . . . . . . . 19 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑟𝑅)
28 simprrr 824 . . . . . . . . . . . . . . . . . . . 20 ((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) → 𝑠𝑆)
2928adantr 472 . . . . . . . . . . . . . . . . . . 19 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑠𝑆)
30 txopn 21599 . . . . . . . . . . . . . . . . . . 19 (((𝑅 ∈ Top ∧ 𝑆 ∈ Top) ∧ (𝑟𝑅𝑠𝑆)) → (𝑟 × 𝑠) ∈ (𝑅 ×t 𝑆))
3123, 25, 27, 29, 30syl22anc 1474 . . . . . . . . . . . . . . . . . 18 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → (𝑟 × 𝑠) ∈ (𝑅 ×t 𝑆))
328ad2antrr 764 . . . . . . . . . . . . . . . . . . . 20 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑦 ∈ (𝑢 × 𝑣))
33 1st2nd2 7364 . . . . . . . . . . . . . . . . . . . 20 (𝑦 ∈ (𝑢 × 𝑣) → 𝑦 = ⟨(1st𝑦), (2nd𝑦)⟩)
3432, 33syl 17 . . . . . . . . . . . . . . . . . . 19 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑦 = ⟨(1st𝑦), (2nd𝑦)⟩)
35 simprl1 1264 . . . . . . . . . . . . . . . . . . . 20 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → (1st𝑦) ∈ 𝑟)
36 simprr1 1270 . . . . . . . . . . . . . . . . . . . 20 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → (2nd𝑦) ∈ 𝑠)
37 opelxpi 5297 . . . . . . . . . . . . . . . . . . . 20 (((1st𝑦) ∈ 𝑟 ∧ (2nd𝑦) ∈ 𝑠) → ⟨(1st𝑦), (2nd𝑦)⟩ ∈ (𝑟 × 𝑠))
3835, 36, 37syl2anc 696 . . . . . . . . . . . . . . . . . . 19 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → ⟨(1st𝑦), (2nd𝑦)⟩ ∈ (𝑟 × 𝑠))
3934, 38eqeltrd 2831 . . . . . . . . . . . . . . . . . 18 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑦 ∈ (𝑟 × 𝑠))
40 opnneip 21117 . . . . . . . . . . . . . . . . . 18 (((𝑅 ×t 𝑆) ∈ Top ∧ (𝑟 × 𝑠) ∈ (𝑅 ×t 𝑆) ∧ 𝑦 ∈ (𝑟 × 𝑠)) → (𝑟 × 𝑠) ∈ ((nei‘(𝑅 ×t 𝑆))‘{𝑦}))
4121, 31, 39, 40syl3anc 1473 . . . . . . . . . . . . . . . . 17 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → (𝑟 × 𝑠) ∈ ((nei‘(𝑅 ×t 𝑆))‘{𝑦}))
42 simprl2 1266 . . . . . . . . . . . . . . . . . 18 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑟𝑎)
43 simprr2 1272 . . . . . . . . . . . . . . . . . 18 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑠𝑏)
44 xpss12 5273 . . . . . . . . . . . . . . . . . 18 ((𝑟𝑎𝑠𝑏) → (𝑟 × 𝑠) ⊆ (𝑎 × 𝑏))
4542, 43, 44syl2anc 696 . . . . . . . . . . . . . . . . 17 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → (𝑟 × 𝑠) ⊆ (𝑎 × 𝑏))
46 simprll 821 . . . . . . . . . . . . . . . . . . . . . 22 ((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) → 𝑎 ∈ 𝒫 𝑢)
4746adantr 472 . . . . . . . . . . . . . . . . . . . . 21 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑎 ∈ 𝒫 𝑢)
4847elpwid 4306 . . . . . . . . . . . . . . . . . . . 20 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑎𝑢)
497ad2antrr 764 . . . . . . . . . . . . . . . . . . . . 21 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑢𝑅)
50 elssuni 4611 . . . . . . . . . . . . . . . . . . . . 21 (𝑢𝑅𝑢 𝑅)
5149, 50syl 17 . . . . . . . . . . . . . . . . . . . 20 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑢 𝑅)
5248, 51sstrd 3746 . . . . . . . . . . . . . . . . . . 19 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑎 𝑅)
53 simprlr 822 . . . . . . . . . . . . . . . . . . . . . 22 ((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) → 𝑏 ∈ 𝒫 𝑣)
5453adantr 472 . . . . . . . . . . . . . . . . . . . . 21 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑏 ∈ 𝒫 𝑣)
5554elpwid 4306 . . . . . . . . . . . . . . . . . . . 20 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑏𝑣)
5614ad2antrr 764 . . . . . . . . . . . . . . . . . . . . 21 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑣𝑆)
57 elssuni 4611 . . . . . . . . . . . . . . . . . . . . 21 (𝑣𝑆𝑣 𝑆)
5856, 57syl 17 . . . . . . . . . . . . . . . . . . . 20 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑣 𝑆)
5955, 58sstrd 3746 . . . . . . . . . . . . . . . . . . 19 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → 𝑏 𝑆)
60 xpss12 5273 . . . . . . . . . . . . . . . . . . 19 ((𝑎 𝑅𝑏 𝑆) → (𝑎 × 𝑏) ⊆ ( 𝑅 × 𝑆))
6152, 59, 60syl2anc 696 . . . . . . . . . . . . . . . . . 18 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → (𝑎 × 𝑏) ⊆ ( 𝑅 × 𝑆))
62 eqid 2752 . . . . . . . . . . . . . . . . . . . 20 𝑅 = 𝑅
63 eqid 2752 . . . . . . . . . . . . . . . . . . . 20 𝑆 = 𝑆
6462, 63txuni 21589 . . . . . . . . . . . . . . . . . . 19 ((𝑅 ∈ Top ∧ 𝑆 ∈ Top) → ( 𝑅 × 𝑆) = (𝑅 ×t 𝑆))
6523, 25, 64syl2anc 696 . . . . . . . . . . . . . . . . . 18 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → ( 𝑅 × 𝑆) = (𝑅 ×t 𝑆))
6661, 65sseqtrd 3774 . . . . . . . . . . . . . . . . 17 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → (𝑎 × 𝑏) ⊆ (𝑅 ×t 𝑆))
67 eqid 2752 . . . . . . . . . . . . . . . . . 18 (𝑅 ×t 𝑆) = (𝑅 ×t 𝑆)
6867ssnei2 21114 . . . . . . . . . . . . . . . . 17 ((((𝑅 ×t 𝑆) ∈ Top ∧ (𝑟 × 𝑠) ∈ ((nei‘(𝑅 ×t 𝑆))‘{𝑦})) ∧ ((𝑟 × 𝑠) ⊆ (𝑎 × 𝑏) ∧ (𝑎 × 𝑏) ⊆ (𝑅 ×t 𝑆))) → (𝑎 × 𝑏) ∈ ((nei‘(𝑅 ×t 𝑆))‘{𝑦}))
6921, 41, 45, 66, 68syl22anc 1474 . . . . . . . . . . . . . . . 16 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → (𝑎 × 𝑏) ∈ ((nei‘(𝑅 ×t 𝑆))‘{𝑦}))
70 xpss12 5273 . . . . . . . . . . . . . . . . . . 19 ((𝑎𝑢𝑏𝑣) → (𝑎 × 𝑏) ⊆ (𝑢 × 𝑣))
7148, 55, 70syl2anc 696 . . . . . . . . . . . . . . . . . 18 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → (𝑎 × 𝑏) ⊆ (𝑢 × 𝑣))
72 simprrr 824 . . . . . . . . . . . . . . . . . . 19 (((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → (𝑢 × 𝑣) ⊆ 𝑥)
7372ad2antrr 764 . . . . . . . . . . . . . . . . . 18 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → (𝑢 × 𝑣) ⊆ 𝑥)
7471, 73sstrd 3746 . . . . . . . . . . . . . . . . 17 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → (𝑎 × 𝑏) ⊆ 𝑥)
75 vex 3335 . . . . . . . . . . . . . . . . . 18 𝑥 ∈ V
7675elpw2 4969 . . . . . . . . . . . . . . . . 17 ((𝑎 × 𝑏) ∈ 𝒫 𝑥 ↔ (𝑎 × 𝑏) ⊆ 𝑥)
7774, 76sylibr 224 . . . . . . . . . . . . . . . 16 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → (𝑎 × 𝑏) ∈ 𝒫 𝑥)
7869, 77elind 3933 . . . . . . . . . . . . . . 15 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → (𝑎 × 𝑏) ∈ (((nei‘(𝑅 ×t 𝑆))‘{𝑦}) ∩ 𝒫 𝑥))
79 txrest 21628 . . . . . . . . . . . . . . . . 17 (((𝑅 ∈ Top ∧ 𝑆 ∈ Top) ∧ (𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣)) → ((𝑅 ×t 𝑆) ↾t (𝑎 × 𝑏)) = ((𝑅t 𝑎) ×t (𝑆t 𝑏)))
8023, 25, 47, 54, 79syl22anc 1474 . . . . . . . . . . . . . . . 16 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → ((𝑅 ×t 𝑆) ↾t (𝑎 × 𝑏)) = ((𝑅t 𝑎) ×t (𝑆t 𝑏)))
81 simprl3 1268 . . . . . . . . . . . . . . . . 17 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → (𝑅t 𝑎) ∈ 𝐴)
82 simprr3 1274 . . . . . . . . . . . . . . . . 17 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → (𝑆t 𝑏) ∈ 𝐴)
83 txlly.1 . . . . . . . . . . . . . . . . . 18 ((𝑗𝐴𝑘𝐴) → (𝑗 ×t 𝑘) ∈ 𝐴)
8483caovcl 6985 . . . . . . . . . . . . . . . . 17 (((𝑅t 𝑎) ∈ 𝐴 ∧ (𝑆t 𝑏) ∈ 𝐴) → ((𝑅t 𝑎) ×t (𝑆t 𝑏)) ∈ 𝐴)
8581, 82, 84syl2anc 696 . . . . . . . . . . . . . . . 16 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → ((𝑅t 𝑎) ×t (𝑆t 𝑏)) ∈ 𝐴)
8680, 85eqeltrd 2831 . . . . . . . . . . . . . . 15 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → ((𝑅 ×t 𝑆) ↾t (𝑎 × 𝑏)) ∈ 𝐴)
87 oveq2 6813 . . . . . . . . . . . . . . . . 17 (𝑧 = (𝑎 × 𝑏) → ((𝑅 ×t 𝑆) ↾t 𝑧) = ((𝑅 ×t 𝑆) ↾t (𝑎 × 𝑏)))
8887eleq1d 2816 . . . . . . . . . . . . . . . 16 (𝑧 = (𝑎 × 𝑏) → (((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴 ↔ ((𝑅 ×t 𝑆) ↾t (𝑎 × 𝑏)) ∈ 𝐴))
8988rspcev 3441 . . . . . . . . . . . . . . 15 (((𝑎 × 𝑏) ∈ (((nei‘(𝑅 ×t 𝑆))‘{𝑦}) ∩ 𝒫 𝑥) ∧ ((𝑅 ×t 𝑆) ↾t (𝑎 × 𝑏)) ∈ 𝐴) → ∃𝑧 ∈ (((nei‘(𝑅 ×t 𝑆))‘{𝑦}) ∩ 𝒫 𝑥)((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴)
9078, 86, 89syl2anc 696 . . . . . . . . . . . . . 14 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) ∧ (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴))) → ∃𝑧 ∈ (((nei‘(𝑅 ×t 𝑆))‘{𝑦}) ∩ 𝒫 𝑥)((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴)
9190ex 449 . . . . . . . . . . . . 13 ((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ ((𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣) ∧ (𝑟𝑅𝑠𝑆))) → ((((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴)) → ∃𝑧 ∈ (((nei‘(𝑅 ×t 𝑆))‘{𝑦}) ∩ 𝒫 𝑥)((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴))
9291anassrs 683 . . . . . . . . . . . 12 (((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ (𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣)) ∧ (𝑟𝑅𝑠𝑆)) → ((((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴)) → ∃𝑧 ∈ (((nei‘(𝑅 ×t 𝑆))‘{𝑦}) ∩ 𝒫 𝑥)((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴))
9392rexlimdvva 3168 . . . . . . . . . . 11 ((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ (𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣)) → (∃𝑟𝑅𝑠𝑆 (((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴)) → ∃𝑧 ∈ (((nei‘(𝑅 ×t 𝑆))‘{𝑦}) ∩ 𝒫 𝑥)((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴))
9420, 93syl5bir 233 . . . . . . . . . 10 ((((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) ∧ (𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣)) → ((∃𝑟𝑅 ((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ∃𝑠𝑆 ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴)) → ∃𝑧 ∈ (((nei‘(𝑅 ×t 𝑆))‘{𝑦}) ∩ 𝒫 𝑥)((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴))
9594rexlimdvva 3168 . . . . . . . . 9 (((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → (∃𝑎 ∈ 𝒫 𝑢𝑏 ∈ 𝒫 𝑣(∃𝑟𝑅 ((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ∃𝑠𝑆 ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴)) → ∃𝑧 ∈ (((nei‘(𝑅 ×t 𝑆))‘{𝑦}) ∩ 𝒫 𝑥)((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴))
9619, 95syl5bir 233 . . . . . . . 8 (((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → ((∃𝑎 ∈ 𝒫 𝑢𝑟𝑅 ((1st𝑦) ∈ 𝑟𝑟𝑎 ∧ (𝑅t 𝑎) ∈ 𝐴) ∧ ∃𝑏 ∈ 𝒫 𝑣𝑠𝑆 ((2nd𝑦) ∈ 𝑠𝑠𝑏 ∧ (𝑆t 𝑏) ∈ 𝐴)) → ∃𝑧 ∈ (((nei‘(𝑅 ×t 𝑆))‘{𝑦}) ∩ 𝒫 𝑥)((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴))
9712, 18, 96mp2and 717 . . . . . . 7 (((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ ((𝑢𝑅𝑣𝑆) ∧ (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥))) → ∃𝑧 ∈ (((nei‘(𝑅 ×t 𝑆))‘{𝑦}) ∩ 𝒫 𝑥)((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴)
9897expr 644 . . . . . 6 (((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) ∧ (𝑢𝑅𝑣𝑆)) → ((𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥) → ∃𝑧 ∈ (((nei‘(𝑅 ×t 𝑆))‘{𝑦}) ∩ 𝒫 𝑥)((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴))
9998rexlimdvva 3168 . . . . 5 ((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) → (∃𝑢𝑅𝑣𝑆 (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥) → ∃𝑧 ∈ (((nei‘(𝑅 ×t 𝑆))‘{𝑦}) ∩ 𝒫 𝑥)((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴))
10099ralimdv 3093 . . . 4 ((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) → (∀𝑦𝑥𝑢𝑅𝑣𝑆 (𝑦 ∈ (𝑢 × 𝑣) ∧ (𝑢 × 𝑣) ⊆ 𝑥) → ∀𝑦𝑥𝑧 ∈ (((nei‘(𝑅 ×t 𝑆))‘{𝑦}) ∩ 𝒫 𝑥)((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴))
1015, 100sylbid 230 . . 3 ((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) → (𝑥 ∈ (𝑅 ×t 𝑆) → ∀𝑦𝑥𝑧 ∈ (((nei‘(𝑅 ×t 𝑆))‘{𝑦}) ∩ 𝒫 𝑥)((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴))
102101ralrimiv 3095 . 2 ((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) → ∀𝑥 ∈ (𝑅 ×t 𝑆)∀𝑦𝑥𝑧 ∈ (((nei‘(𝑅 ×t 𝑆))‘{𝑦}) ∩ 𝒫 𝑥)((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴)
103 isnlly 21466 . 2 ((𝑅 ×t 𝑆) ∈ 𝑛-Locally 𝐴 ↔ ((𝑅 ×t 𝑆) ∈ Top ∧ ∀𝑥 ∈ (𝑅 ×t 𝑆)∀𝑦𝑥𝑧 ∈ (((nei‘(𝑅 ×t 𝑆))‘{𝑦}) ∩ 𝒫 𝑥)((𝑅 ×t 𝑆) ↾t 𝑧) ∈ 𝐴))
1044, 102, 103sylanbrc 701 1 ((𝑅 ∈ 𝑛-Locally 𝐴𝑆 ∈ 𝑛-Locally 𝐴) → (𝑅 ×t 𝑆) ∈ 𝑛-Locally 𝐴)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 383   ∧ w3a 1072   = wceq 1624   ∈ wcel 2131  ∀wral 3042  ∃wrex 3043   ∩ cin 3706   ⊆ wss 3707  𝒫 cpw 4294  {csn 4313  ⟨cop 4319  ∪ cuni 4580   × cxp 5256  ‘cfv 6041  (class class class)co 6805  1st c1st 7323  2nd c2nd 7324   ↾t crest 16275  Topctop 20892  neicnei 21095  𝑛-Locally cnlly 21462   ×t ctx 21557 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1863  ax-4 1878  ax-5 1980  ax-6 2046  ax-7 2082  ax-8 2133  ax-9 2140  ax-10 2160  ax-11 2175  ax-12 2188  ax-13 2383  ax-ext 2732  ax-rep 4915  ax-sep 4925  ax-nul 4933  ax-pow 4984  ax-pr 5047  ax-un 7106 This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1074  df-tru 1627  df-ex 1846  df-nf 1851  df-sb 2039  df-eu 2603  df-mo 2604  df-clab 2739  df-cleq 2745  df-clel 2748  df-nfc 2883  df-ne 2925  df-ral 3047  df-rex 3048  df-reu 3049  df-rab 3051  df-v 3334  df-sbc 3569  df-csb 3667  df-dif 3710  df-un 3712  df-in 3714  df-ss 3721  df-nul 4051  df-if 4223  df-pw 4296  df-sn 4314  df-pr 4316  df-op 4320  df-uni 4581  df-iun 4666  df-br 4797  df-opab 4857  df-mpt 4874  df-id 5166  df-xp 5264  df-rel 5265  df-cnv 5266  df-co 5267  df-dm 5268  df-rn 5269  df-res 5270  df-ima 5271  df-iota 6004  df-fun 6043  df-fn 6044  df-f 6045  df-f1 6046  df-fo 6047  df-f1o 6048  df-fv 6049  df-ov 6808  df-oprab 6809  df-mpt2 6810  df-1st 7325  df-2nd 7326  df-rest 16277  df-topgen 16298  df-top 20893  df-topon 20910  df-bases 20944  df-nei 21096  df-nlly 21464  df-tx 21559 This theorem is referenced by:  xkohmeo  21812  cvmlift2lem13  31596
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