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Theorem mpteq2i 4218
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 4217 1 (𝑥 ∈ 𝐴 ↦ 𝐵) = (𝑥 ∈ 𝐴 ↦ 𝐶)
Colors of variables:    wff set class
This proof depends on syntax axioms:   = wceq 1402   ∈ wcel 2209   ↦ cmpt 4192
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 4193  df-mpt 4194
This theorem is used by:  frecsuc  6678  fodjuomni  7490  fodjumkv  7501  axcaucvg  8268  0tonninf  10892  1tonninf  10893  cbvsum  12145  cbvprod  12344  eirraplem  12563  ballotfilemfc0  13284  ballotfilemfcc  13285  ballotfi  13334  znzrh2  15065  cnmpt12f  15478  fsumcncntop  15759  dvmptfsum  15917  dvef  15919  plyco  15951  plycj  15953  nninfsellemqall  17224  nninfomni  17228  nnnninfex  17231  exmidsbthr  17234
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