Theorem mpteq2ia 4175

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 2231	. . 3 ⊢ 𝐴 = 𝐴
2	1	ax-gen 1497	. 2 ⊢ ∀𝑥 𝐴 = 𝐴
3		mpteq2ia.1	. . 3 ⊢ (𝑥 ∈ 𝐴 → 𝐵 = 𝐶)
4	3	rgen 2585	. 2 ⊢ ∀𝑥 ∈ 𝐴 𝐵 = 𝐶
5		mpteq12f 4169	. 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 1395   = wceq 1397   ∈ wcel 2202  ∀wral 2510   ↦ cmpt 4150

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 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-11 1554  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-ext 2213

This theorem depends on definitions:  df-bi 117  df-tru 1400  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-ral 2515  df-opab 4151  df-mpt 4152

This theorem is referenced by:  mpteq2i  4176  feqresmpt  5700  elfvmptrab  5742  fmptap  5844  offres  6297  cnrecnv  11488  ege2le3  12250  eirraplem  12356  cnmpt1st  15031  cnmpt2nd  15032  expcn  15312  expcncf  15352  dvexp  15454  dveflem  15469  dvef  15470  elply2  15478  plyid  15489