Theorem mpteq2ia 4104

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 2189	. . 3 ⊢ 𝐴 = 𝐴
2	1	ax-gen 1460	. 2 ⊢ ∀𝑥 𝐴 = 𝐴
3		mpteq2ia.1	. . 3 ⊢ (𝑥 ∈ 𝐴 → 𝐵 = 𝐶)
4	3	rgen 2543	. 2 ⊢ ∀𝑥 ∈ 𝐴 𝐵 = 𝐶
5		mpteq12f 4098	. 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 1362   = wceq 1364   ∈ wcel 2160  ∀wral 2468   ↦ cmpt 4079

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 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-11 1517  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-ext 2171

This theorem depends on definitions:  df-bi 117  df-tru 1367  df-nf 1472  df-sb 1774  df-clab 2176  df-cleq 2182  df-clel 2185  df-ral 2473  df-opab 4080  df-mpt 4081

This theorem is referenced by:  mpteq2i  4105  feqresmpt  5591  elfvmptrab  5632  fmptap  5727  offres  6160  cnrecnv  10951  ege2le3  11711  eirraplem  11816  cnmpt1st  14245  cnmpt2nd  14246  expcncf  14549  dvexp  14632  dveflem  14644  dvef  14645