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Theorem pttopon 23490

Description: The base set for the product topology. (Contributed by Mario Carneiro, 22-Aug-2015.)

**Hypothesis**
Ref	Expression
ptunimpt.j	⊢ 𝐽 = (∏_t‘(𝑥 ∈ 𝐴 ↦ 𝐾))

**Assertion**
Ref	Expression
pttopon	⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵)) → 𝐽 ∈ (TopOn‘X𝑥 ∈ 𝐴 𝐵))

Distinct variable group: 𝑥,𝐴 Allowed substitution hints: 𝐵(𝑥) 𝐽(𝑥) 𝐾(𝑥) 𝑉(𝑥)

**Proof of Theorem pttopon**
Step	Hyp	Ref	Expression
1		topontop 22807	. . . . 5 ⊢ (𝐾 ∈ (TopOn‘𝐵) → 𝐾 ∈ Top)
2	1	ralimi 3067	. . . 4 ⊢ (∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵) → ∀𝑥 ∈ 𝐴 𝐾 ∈ Top)
3		eqid 2730	. . . . 5 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐾) = (𝑥 ∈ 𝐴 ↦ 𝐾)
4	3	fmpt 7085	. . . 4 ⊢ (∀𝑥 ∈ 𝐴 𝐾 ∈ Top ↔ (𝑥 ∈ 𝐴 ↦ 𝐾):𝐴⟶Top)
5	2, 4	sylib 218	. . 3 ⊢ (∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵) → (𝑥 ∈ 𝐴 ↦ 𝐾):𝐴⟶Top)
6		ptunimpt.j	. . . 4 ⊢ 𝐽 = (∏_t‘(𝑥 ∈ 𝐴 ↦ 𝐾))
7		pttop 23476	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ 𝐴 ↦ 𝐾):𝐴⟶Top) → (∏_t‘(𝑥 ∈ 𝐴 ↦ 𝐾)) ∈ Top)
8	6, 7	eqeltrid 2833	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ 𝐴 ↦ 𝐾):𝐴⟶Top) → 𝐽 ∈ Top)
9	5, 8	sylan2 593	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵)) → 𝐽 ∈ Top)
10		toponuni 22808	. . . . . 6 ⊢ (𝐾 ∈ (TopOn‘𝐵) → 𝐵 = ∪ 𝐾)
11	10	ralimi 3067	. . . . 5 ⊢ (∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵) → ∀𝑥 ∈ 𝐴 𝐵 = ∪ 𝐾)
12		ixpeq2 8887	. . . . 5 ⊢ (∀𝑥 ∈ 𝐴 𝐵 = ∪ 𝐾 → X𝑥 ∈ 𝐴 𝐵 = X𝑥 ∈ 𝐴 ∪ 𝐾)
13	11, 12	syl 17	. . . 4 ⊢ (∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵) → X𝑥 ∈ 𝐴 𝐵 = X𝑥 ∈ 𝐴 ∪ 𝐾)
14	13	adantl 481	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵)) → X𝑥 ∈ 𝐴 𝐵 = X𝑥 ∈ 𝐴 ∪ 𝐾)
15	6	ptunimpt 23489	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ Top) → X𝑥 ∈ 𝐴 ∪ 𝐾 = ∪ 𝐽)
16	2, 15	sylan2 593	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵)) → X𝑥 ∈ 𝐴 ∪ 𝐾 = ∪ 𝐽)
17	14, 16	eqtrd 2765	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵)) → X𝑥 ∈ 𝐴 𝐵 = ∪ 𝐽)
18		istopon 22806	. 2 ⊢ (𝐽 ∈ (TopOn‘X𝑥 ∈ 𝐴 𝐵) ↔ (𝐽 ∈ Top ∧ X𝑥 ∈ 𝐴 𝐵 = ∪ 𝐽))
19	9, 17, 18	sylanbrc 583	1 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵)) → 𝐽 ∈ (TopOn‘X𝑥 ∈ 𝐴 𝐵))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1540 ∈ wcel 2109 ∀wral 3045 ∪ cuni 4874 ↦ cmpt 5191 ⟶wf 6510 ‘cfv 6514 Xcixp 8873 ∏_tcpt 17408 Topctop 22787 TopOnctopon 22804

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2702 ax-rep 5237 ax-sep 5254 ax-nul 5264 ax-pow 5323 ax-pr 5390 ax-un 7714

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-ral 3046 df-rex 3055 df-reu 3357 df-rab 3409 df-v 3452 df-sbc 3757 df-csb 3866 df-dif 3920 df-un 3922 df-in 3924 df-ss 3934 df-pss 3937 df-nul 4300 df-if 4492 df-pw 4568 df-sn 4593 df-pr 4595 df-op 4599 df-uni 4875 df-int 4914 df-iun 4960 df-br 5111 df-opab 5173 df-mpt 5192 df-tr 5218 df-id 5536 df-eprel 5541 df-po 5549 df-so 5550 df-fr 5594 df-we 5596 df-xp 5647 df-rel 5648 df-cnv 5649 df-co 5650 df-dm 5651 df-rn 5652 df-res 5653 df-ima 5654 df-ord 6338 df-on 6339 df-lim 6340 df-suc 6341 df-iota 6467 df-fun 6516 df-fn 6517 df-f 6518 df-f1 6519 df-fo 6520 df-f1o 6521 df-fv 6522 df-om 7846 df-1o 8437 df-2o 8438 df-ixp 8874 df-en 8922 df-fin 8925 df-fi 9369 df-topgen 17413 df-pt 17414 df-top 22788 df-topon 22805 df-bases 22840

This theorem is referenced by: pttoponconst 23491 ptclsg 23509 dfac14lem 23511 ptcnp 23516 prdstps 23523

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