pttopon - Metamath Proof Explorer

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Theorem pttopon 23552

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 22869	. . . . 5 ⊢ (𝐾 ∈ (TopOn‘𝐵) → 𝐾 ∈ Top)
2	1	ralimi 3075	. . . 4 ⊢ (∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵) → ∀𝑥 ∈ 𝐴 𝐾 ∈ Top)
3		eqid 2737	. . . . 5 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐾) = (𝑥 ∈ 𝐴 ↦ 𝐾)
4	3	fmpt 7064	. . . 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 23538	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ 𝐴 ↦ 𝐾):𝐴⟶Top) → (∏_t‘(𝑥 ∈ 𝐴 ↦ 𝐾)) ∈ Top)
8	6, 7	eqeltrid 2841	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ 𝐴 ↦ 𝐾):𝐴⟶Top) → 𝐽 ∈ Top)
9	5, 8	sylan2 594	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵)) → 𝐽 ∈ Top)
10		toponuni 22870	. . . . . 6 ⊢ (𝐾 ∈ (TopOn‘𝐵) → 𝐵 = ∪ 𝐾)
11	10	ralimi 3075	. . . . 5 ⊢ (∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵) → ∀𝑥 ∈ 𝐴 𝐵 = ∪ 𝐾)
12		ixpeq2 8861	. . . . 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 23551	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ Top) → X𝑥 ∈ 𝐴 ∪ 𝐾 = ∪ 𝐽)
16	2, 15	sylan2 594	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵)) → X𝑥 ∈ 𝐴 ∪ 𝐾 = ∪ 𝐽)
17	14, 16	eqtrd 2772	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ (TopOn‘𝐵)) → X𝑥 ∈ 𝐴 𝐵 = ∪ 𝐽)
18		istopon 22868	. 2 ⊢ (𝐽 ∈ (TopOn‘X𝑥 ∈ 𝐴 𝐵) ↔ (𝐽 ∈ Top ∧ X𝑥 ∈ 𝐴 𝐵 = ∪ 𝐽))
19	9, 17, 18	sylanbrc 584	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 1542 ∈ wcel 2114 ∀wral 3052 ∪ cuni 4865 ↦ cmpt 5181 ⟶wf 6496 ‘cfv 6500 Xcixp 8847 ∏_tcpt 17370 Topctop 22849 TopOnctopon 22866

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5226 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690

This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-op 4589 df-uni 4866 df-int 4905 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5527 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-ord 6328 df-on 6329 df-lim 6330 df-suc 6331 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-om 7819 df-1o 8407 df-2o 8408 df-ixp 8848 df-en 8896 df-fin 8899 df-fi 9326 df-topgen 17375 df-pt 17376 df-top 22850 df-topon 22867 df-bases 22902

This theorem is referenced by: pttoponconst 23553 ptclsg 23571 dfac14lem 23573 ptcnp 23578 prdstps 23585

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