Theorem ptunimpt 22654

Description: Base set of a product topology given by substitution. (Contributed by Stefan O'Rear, 22-Feb-2015.)

Hypothesis

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

Assertion

Ref	Expression
ptunimpt	⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ Top) → X𝑥 ∈ 𝐴 ∪ 𝐾 = ∪ 𝐽)

Distinct variable group:   𝑥,𝐴

Allowed substitution hints:   𝐽(𝑥)   𝐾(𝑥)   𝑉(𝑥)

Proof of Theorem ptunimpt

Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqid 2738	. . . . . . . . 9 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐾) = (𝑥 ∈ 𝐴 ↦ 𝐾)
2	1	fvmpt2 6868	. . . . . . . 8 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝐾 ∈ Top) → ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥) = 𝐾)
3	2	eqcomd 2744	. . . . . . 7 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝐾 ∈ Top) → 𝐾 = ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥))
4	3	unieqd 4850	. . . . . 6 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝐾 ∈ Top) → ∪ 𝐾 = ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥))
5	4	ralimiaa 3085	. . . . 5 ⊢ (∀𝑥 ∈ 𝐴 𝐾 ∈ Top → ∀𝑥 ∈ 𝐴 ∪ 𝐾 = ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥))
6	5	adantl 481	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ Top) → ∀𝑥 ∈ 𝐴 ∪ 𝐾 = ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥))
7		ixpeq2 8657	. . . 4 ⊢ (∀𝑥 ∈ 𝐴 ∪ 𝐾 = ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥) → X𝑥 ∈ 𝐴 ∪ 𝐾 = X𝑥 ∈ 𝐴 ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥))
8	6, 7	syl 17	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ Top) → X𝑥 ∈ 𝐴 ∪ 𝐾 = X𝑥 ∈ 𝐴 ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥))
9		nffvmpt1 6767	. . . . 5 ⊢ Ⅎ𝑥((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑦)
10	9	nfuni 4843	. . . 4 ⊢ Ⅎ𝑥∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑦)
11		nfcv 2906	. . . 4 ⊢ Ⅎ𝑦∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥)
12		fveq2 6756	. . . . 5 ⊢ (𝑦 = 𝑥 → ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑦) = ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥))
13	12	unieqd 4850	. . . 4 ⊢ (𝑦 = 𝑥 → ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑦) = ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥))
14	10, 11, 13	cbvixp 8660	. . 3 ⊢ X𝑦 ∈ 𝐴 ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑦) = X𝑥 ∈ 𝐴 ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥)
15	8, 14	eqtr4di 2797	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ Top) → X𝑥 ∈ 𝐴 ∪ 𝐾 = X𝑦 ∈ 𝐴 ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑦))
16	1	fmpt 6966	. . 3 ⊢ (∀𝑥 ∈ 𝐴 𝐾 ∈ Top ↔ (𝑥 ∈ 𝐴 ↦ 𝐾):𝐴⟶Top)
17		ptunimpt.j	. . . 4 ⊢ 𝐽 = (∏t‘(𝑥 ∈ 𝐴 ↦ 𝐾))
18	17	ptuni 22653	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ 𝐴 ↦ 𝐾):𝐴⟶Top) → X𝑦 ∈ 𝐴 ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑦) = ∪ 𝐽)
19	16, 18	sylan2b 593	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ Top) → X𝑦 ∈ 𝐴 ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑦) = ∪ 𝐽)
20	15, 19	eqtrd 2778	1 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ Top) → X𝑥 ∈ 𝐴 ∪ 𝐾 = ∪ 𝐽)

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1539   ∈ wcel 2108  ∀wral 3063  ∪ cuni 4836   ↦ cmpt 5153  ⟶wf 6414  ‘cfv 6418  Xcixp 8643  ∏_tcpt 17066  Topctop 21950

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709  ax-rep 5205  ax-sep 5218  ax-nul 5225  ax-pow 5283  ax-pr 5347  ax-un 7566

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3or 1086  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-nf 1788  df-sb 2069  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2817  df-nfc 2888  df-ne 2943  df-ral 3068  df-rex 3069  df-reu 3070  df-rab 3072  df-v 3424  df-sbc 3712  df-csb 3829  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-pss 3902  df-nul 4254  df-if 4457  df-pw 4532  df-sn 4559  df-pr 4561  df-tp 4563  df-op 4565  df-uni 4837  df-int 4877  df-iun 4923  df-br 5071  df-opab 5133  df-mpt 5154  df-tr 5188  df-id 5480  df-eprel 5486  df-po 5494  df-so 5495  df-fr 5535  df-we 5537  df-xp 5586  df-rel 5587  df-cnv 5588  df-co 5589  df-dm 5590  df-rn 5591  df-res 5592  df-ima 5593  df-ord 6254  df-on 6255  df-lim 6256  df-suc 6257  df-iota 6376  df-fun 6420  df-fn 6421  df-f 6422  df-f1 6423  df-fo 6424  df-f1o 6425  df-fv 6426  df-om 7688  df-1o 8267  df-er 8456  df-ixp 8644  df-en 8692  df-fin 8695  df-fi 9100  df-topgen 17071  df-pt 17072  df-top 21951  df-bases 22004

This theorem is referenced by:  pttopon  22655  kelac1  40804