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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 (𝑥𝐴𝐵) = (𝑥𝐴𝐶)

Proof of Theorem mpteq2i
StepHypRef Expression
1 mpteq2i.1 . . 3 𝐵 = 𝐶
21a1i 9 . 2 (𝑥𝐴𝐵 = 𝐶)
32mpteq2ia 4217 1 (𝑥𝐴𝐵) = (𝑥𝐴𝐶)
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  7489  fodjumkv  7500  axcaucvg  8267  0tonninf  10877  1tonninf  10878  cbvsum  12126  cbvprod  12325  eirraplem  12544  ballotfilemfc0  13232  ballotfilemfcc  13233  ballotfi  13282  znzrh2  14981  cnmpt12f  15387  fsumcncntop  15668  dvmptfsum  15826  dvef  15828  plyco  15860  plycj  15862  nninfsellemqall  17058  nninfomni  17062  nnnninfex  17065  exmidsbthr  17068
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