Theorem acneq 10161

Description: Equality theorem for the choice set function. (Contributed by Mario Carneiro, 31-Aug-2015.)

Assertion

Ref	Expression
acneq	⊢ (𝐴 = 𝐶 → AC 𝐴 = AC 𝐶)

Proof of Theorem acneq

Dummy variables 𝑓 𝑔 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		eleq1 2852	. . . 4 ⊢ (𝐴 = 𝐶 → (𝐴 ∈ V ↔ 𝐶 ∈ V))
2		oveq2 7459	. . . . 5 ⊢ (𝐴 = 𝐶 → ((𝒫 𝑥 ∖ {∅}) ↑m 𝐴) = ((𝒫 𝑥 ∖ {∅}) ↑m 𝐶))
3		raleq 3320	. . . . . 6 ⊢ (𝐴 = 𝐶 → (∀𝑦 ∈ 𝐴 (𝑔‘𝑦) ∈ (𝑓‘𝑦) ↔ ∀𝑦 ∈ 𝐶 (𝑔‘𝑦) ∈ (𝑓‘𝑦)))
4	3	exbidv 1956	. . . . 5 ⊢ (𝐴 = 𝐶 → (∃𝑔∀𝑦 ∈ 𝐴 (𝑔‘𝑦) ∈ (𝑓‘𝑦) ↔ ∃𝑔∀𝑦 ∈ 𝐶 (𝑔‘𝑦) ∈ (𝑓‘𝑦)))
5	2, 4	raleqbidv 3338	. . . 4 ⊢ (𝐴 = 𝐶 → (∀𝑓 ∈ ((𝒫 𝑥 ∖ {∅}) ↑m 𝐴)∃𝑔∀𝑦 ∈ 𝐴 (𝑔‘𝑦) ∈ (𝑓‘𝑦) ↔ ∀𝑓 ∈ ((𝒫 𝑥 ∖ {∅}) ↑m 𝐶)∃𝑔∀𝑦 ∈ 𝐶 (𝑔‘𝑦) ∈ (𝑓‘𝑦)))
6	1, 5	anbi12d 644	. . 3 ⊢ (𝐴 = 𝐶 → ((𝐴 ∈ V ∧ ∀𝑓 ∈ ((𝒫 𝑥 ∖ {∅}) ↑m 𝐴)∃𝑔∀𝑦 ∈ 𝐴 (𝑔‘𝑦) ∈ (𝑓‘𝑦)) ↔ (𝐶 ∈ V ∧ ∀𝑓 ∈ ((𝒫 𝑥 ∖ {∅}) ↑m 𝐶)∃𝑔∀𝑦 ∈ 𝐶 (𝑔‘𝑦) ∈ (𝑓‘𝑦))))
7	6	abbidv 2829	. 2 ⊢ (𝐴 = 𝐶 → {𝑥 ∣ (𝐴 ∈ V ∧ ∀𝑓 ∈ ((𝒫 𝑥 ∖ {∅}) ↑m 𝐴)∃𝑔∀𝑦 ∈ 𝐴 (𝑔‘𝑦) ∈ (𝑓‘𝑦))} = {𝑥 ∣ (𝐶 ∈ V ∧ ∀𝑓 ∈ ((𝒫 𝑥 ∖ {∅}) ↑m 𝐶)∃𝑔∀𝑦 ∈ 𝐶 (𝑔‘𝑦) ∈ (𝑓‘𝑦))})
8		df-acn 10060	. 2 ⊢ AC 𝐴 = {𝑥 ∣ (𝐴 ∈ V ∧ ∀𝑓 ∈ ((𝒫 𝑥 ∖ {∅}) ↑m 𝐴)∃𝑔∀𝑦 ∈ 𝐴 (𝑔‘𝑦) ∈ (𝑓‘𝑦))}
9		df-acn 10060	. 2 ⊢ AC 𝐶 = {𝑥 ∣ (𝐶 ∈ V ∧ ∀𝑓 ∈ ((𝒫 𝑥 ∖ {∅}) ↑m 𝐶)∃𝑔∀𝑦 ∈ 𝐶 (𝑔‘𝑦) ∈ (𝑓‘𝑦))}
10	7, 8, 9	3eqtr4g 2823	1 ⊢ (𝐴 = 𝐶 → AC 𝐴 = AC 𝐶)

This proof depends on syntax axioms:   → wi 4   ∧ wa 401   = wceq 1570  ∃wex 1812   ∈ wcel 2147  {cab 2741  ∀wral 3080  Vcvv 3454   ∖ cdif 4048  ∅c0 4281  𝒫 cpw 4560  {csn 4588  ‘cfv 6566  (class class class)co 7451   ↑_m cmap 8885  AC wacn 10056

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-ext 2735

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2102  df-clab 2742  df-cleq 2755  df-clel 2839  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4841  df-uni 4873  df-br 5109  df-iota 6520  df-fv 6574  df-ov 7454  df-acn 10060

This theorem is used by:  acndom  10169  dfacacn  10259  dfac13  10260