pttopon - Metamath Proof Explorer

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Theorem pttopon 23579

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 22896	. . . . 5 ⊢ (𝐾 ∈ (TopOn‘𝐵) → 𝐾 ∈ Top)
2	1	ralimi 3076	. . . 4 ⊢ (∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵) → ∀𝑥 ∈ 𝐴 𝐾 ∈ Top)
3		eqid 2739	. . . . 5 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐾) = (𝑥 ∈ 𝐴 ↦ 𝐾)
4	3	fmpt 7051	. . . 4 ⊢ (∀𝑥 ∈ 𝐴 𝐾 ∈ Top ↔ (𝑥 ∈ 𝐴 ↦ 𝐾):𝐴⟶Top)
5	2, 4	sylib 219	. . 3 ⊢ (∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵) → (𝑥 ∈ 𝐴 ↦ 𝐾):𝐴⟶Top)
6		ptunimpt.j	. . . 4 ⊢ 𝐽 = (∏_t‘(𝑥 ∈ 𝐴 ↦ 𝐾))
7		pttop 23565	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ 𝐴 ↦ 𝐾):𝐴⟶Top) → (∏_t‘(𝑥 ∈ 𝐴 ↦ 𝐾)) ∈ Top)
8	6, 7	eqeltrid 2843	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ 𝐴 ↦ 𝐾):𝐴⟶Top) → 𝐽 ∈ Top)
9	5, 8	sylan2 599	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵)) → 𝐽 ∈ Top)
10		toponuni 22897	. . . . . 6 ⊢ (𝐾 ∈ (TopOn‘𝐵) → 𝐵 = ∪ 𝐾)
11	10	ralimi 3076	. . . . 5 ⊢ (∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵) → ∀𝑥 ∈ 𝐴 𝐵 = ∪ 𝐾)
12		ixpeq2 8849	. . . . 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 482	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵)) → X𝑥 ∈ 𝐴 𝐵 = X𝑥 ∈ 𝐴 ∪ 𝐾)
15	6	ptunimpt 23578	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ Top) → X𝑥 ∈ 𝐴 ∪ 𝐾 = ∪ 𝐽)
16	2, 15	sylan2 599	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵)) → X𝑥 ∈ 𝐴 ∪ 𝐾 = ∪ 𝐽)
17	14, 16	eqtrd 2774	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵)) → X𝑥 ∈ 𝐴 𝐵 = ∪ 𝐽)
18		istopon 22895	. 2 ⊢ (𝐽 ∈ (TopOn‘X𝑥 ∈ 𝐴 𝐵) ↔ (𝐽 ∈ Top ∧ X𝑥 ∈ 𝐴 𝐵 = ∪ 𝐽))
19	9, 17, 18	sylanbrc 589	1 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵)) → 𝐽 ∈ (TopOn‘X𝑥 ∈ 𝐴 𝐵))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 396 = wceq 1547 ∈ wcel 2119 ∀wral 3053 ∪ cuni 4838 ↦ cmpt 5153 ⟶wf 6481 ‘cfv 6485 Xcixp 8835 ∏_tcpt 17392 Topctop 22876 TopOnctopon 22893

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2711 ax-rep 5199 ax-sep 5218 ax-nul 5228 ax-pow 5294 ax-pr 5362 ax-un 7678

This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3or 1093 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2718 df-cleq 2731 df-clel 2814 df-nfc 2888 df-ne 2935 df-ral 3054 df-rex 3064 df-reu 3345 df-rab 3392 df-v 3433 df-sbc 3724 df-csb 3832 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3903 df-nul 4262 df-if 4455 df-pw 4531 df-sn 4556 df-pr 4558 df-op 4562 df-uni 4839 df-int 4878 df-iun 4923 df-br 5073 df-opab 5135 df-mpt 5154 df-tr 5180 df-id 5513 df-eprel 5518 df-po 5526 df-so 5527 df-fr 5571 df-we 5573 df-xp 5624 df-rel 5625 df-cnv 5626 df-co 5627 df-dm 5628 df-rn 5629 df-res 5630 df-ima 5631 df-ord 6313 df-on 6314 df-lim 6315 df-suc 6316 df-iota 6441 df-fun 6487 df-fn 6488 df-f 6489 df-f1 6490 df-fo 6491 df-f1o 6492 df-fv 6493 df-om 7807 df-1o 8395 df-2o 8396 df-ixp 8836 df-en 8884 df-fin 8887 df-fi 9314 df-topgen 17397 df-pt 17398 df-top 22877 df-topon 22894 df-bases 22929

This theorem is referenced by: pttoponconst 23580 ptclsg 23598 dfac14lem 23600 ptcnp 23605 prdstps 23612

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