Theorem ptunimpt 21398

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 2622	. . . . . . . . 9 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐾) = (𝑥 ∈ 𝐴 ↦ 𝐾)
2	1	fvmpt2 6291	. . . . . . . 8 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝐾 ∈ Top) → ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥) = 𝐾)
3	2	eqcomd 2628	. . . . . . 7 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝐾 ∈ Top) → 𝐾 = ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥))
4	3	unieqd 4446	. . . . . 6 ⊢ ((𝑥 ∈ 𝐴 ∧ 𝐾 ∈ Top) → ∪ 𝐾 = ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥))
5	4	ralimiaa 2951	. . . . 5 ⊢ (∀𝑥 ∈ 𝐴 𝐾 ∈ Top → ∀𝑥 ∈ 𝐴 ∪ 𝐾 = ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥))
6	5	adantl 482	. . . 4 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ Top) → ∀𝑥 ∈ 𝐴 ∪ 𝐾 = ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥))
7		ixpeq2 7922	. . . 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 6199	. . . . 5 ⊢ Ⅎ𝑥((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑦)
10	9	nfuni 4442	. . . 4 ⊢ Ⅎ𝑥∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑦)
11		nfcv 2764	. . . 4 ⊢ Ⅎ𝑦∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥)
12		fveq2 6191	. . . . 5 ⊢ (𝑦 = 𝑥 → ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑦) = ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥))
13	12	unieqd 4446	. . . 4 ⊢ (𝑦 = 𝑥 → ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑦) = ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥))
14	10, 11, 13	cbvixp 7925	. . 3 ⊢ X𝑦 ∈ 𝐴 ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑦) = X𝑥 ∈ 𝐴 ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑥)
15	8, 14	syl6eqr 2674	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ Top) → X𝑥 ∈ 𝐴 ∪ 𝐾 = X𝑦 ∈ 𝐴 ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑦))
16	1	fmpt 6381	. . 3 ⊢ (∀𝑥 ∈ 𝐴 𝐾 ∈ Top ↔ (𝑥 ∈ 𝐴 ↦ 𝐾):𝐴⟶Top)
17		ptunimpt.j	. . . 4 ⊢ 𝐽 = (∏t‘(𝑥 ∈ 𝐴 ↦ 𝐾))
18	17	ptuni 21397	. . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ (𝑥 ∈ 𝐴 ↦ 𝐾):𝐴⟶Top) → X𝑦 ∈ 𝐴 ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑦) = ∪ 𝐽)
19	16, 18	sylan2b 492	. 2 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ Top) → X𝑦 ∈ 𝐴 ∪ ((𝑥 ∈ 𝐴 ↦ 𝐾)‘𝑦) = ∪ 𝐽)
20	15, 19	eqtrd 2656	1 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥 ∈ 𝐴 𝐾 ∈ Top) → X𝑥 ∈ 𝐴 ∪ 𝐾 = ∪ 𝐽)

Syntax hints:   → wi 4   ∧ wa 384   = wceq 1483   ∈ wcel 1990  ∀wral 2912  ∪ cuni 4436   ↦ cmpt 4729  ⟶wf 5884  ‘cfv 5888  Xcixp 7908  ∏_tcpt 16099  Topctop 20698

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-reu 2919  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-int 4476  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-oadd 7564  df-er 7742  df-ixp 7909  df-en 7956  df-fin 7959  df-fi 8317  df-topgen 16104  df-pt 16105  df-top 20699  df-bases 20750

This theorem is referenced by:  pttopon  21399  kelac1  37633