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Theorem mpteq2i 4220
Description: An equality inference for the maps-to notation. (Contributed by Mario Carneiro, 16-Dec-2013.)
Hypothesis
Ref Expression
mpteq2i.1 𝐵 = 𝐶
Assertion
Ref Expression
mpteq2i (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐴 ↦ 𝐶)

Proof of Theorem mpteq2i
StepHypRef Expression
1 mpteq2i.1 . . 3 𝐵 = 𝐶
21a1i 9 . 2 (𝑥 ∈ 𝐴 → 𝐵 = 𝐶)
32mpteq2ia 4219 1 (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐴 ↦ 𝐶)
Colors of variables:    wff set class
This proof depends on syntax axioms:   = wceq 1402   ∈ wcel 2209   ↦ cmpt 4193
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-11 1559  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220
This proof depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-ral 2533  df-opab 4194  df-mpt 4195
This theorem is used by:  frecsuc  6682  fodjuomni  7495  fodjumkv  7506  axcaucvg  8273  0tonninf  10898  1tonninf  10899  cbvsum  12151  cbvprod  12350  eirraplem  12569  ballotfilemfc0  13290  ballotfilemfcc  13291  ballotfi  13340  znzrh2  15090  cnmpt12f  15512  fsumcncntop  15793  dvmptfsum  15951  dvef  15953  plyco  15985  plycj  15987  nninfsellemqall  17264  nninfomni  17268  nnnninfex  17271  exmidsbthr  17274
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