Theorem mpteq2ia 4173

Description: An equality inference for the maps-to notation. (Contributed by Mario Carneiro, 16-Dec-2013.)

Hypothesis

Ref	Expression
mpteq2ia.1	⊢ (𝑥 ∈ 𝐴 → 𝐵 = 𝐶)

Assertion

Ref	Expression
mpteq2ia	⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐴 ↦ 𝐶)

Proof of Theorem mpteq2ia

Step	Hyp	Ref	Expression
1		eqid 2229	. . 3 ⊢ 𝐴 = 𝐴
2	1	ax-gen 1495	. 2 ⊢ ∀𝑥 𝐴 = 𝐴
3		mpteq2ia.1	. . 3 ⊢ (𝑥 ∈ 𝐴 → 𝐵 = 𝐶)
4	3	rgen 2583	. 2 ⊢ ∀𝑥 ∈ 𝐴 𝐵 = 𝐶
5		mpteq12f 4167	. 2 ⊢ ((∀𝑥 𝐴 = 𝐴 ∧ ∀𝑥 ∈ 𝐴 𝐵 = 𝐶) → (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐴 ↦ 𝐶))
6	2, 4, 5	mp2an 426	1 ⊢ (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐴 ↦ 𝐶)

Syntax hints:   → wi 4  ∀wal 1393   = wceq 1395   ∈ wcel 2200  ∀wral 2508   ↦ cmpt 4148

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-11 1552  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-ext 2211

This theorem depends on definitions:  df-bi 117  df-tru 1398  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-ral 2513  df-opab 4149  df-mpt 4150

This theorem is referenced by:  mpteq2i  4174  feqresmpt  5696  elfvmptrab  5738  fmptap  5839  offres  6292  cnrecnv  11461  ege2le3  12222  eirraplem  12328  cnmpt1st  15002  cnmpt2nd  15003  expcn  15283  expcncf  15323  dvexp  15425  dveflem  15440  dvef  15441  elply2  15449  plyid  15460