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Theorem imaeq2 5125
Description: Equality theorem for image. (Contributed by NM, 14-Aug-1994.)
Assertion
Ref Expression
imaeq2 (𝐴 = 𝐵 → (𝐶 “ 𝐴) = (𝐶 “ 𝐵))

Proof of Theorem imaeq2
StepHypRef Expression
1 reseq2 5060 . . 3 (𝐴 = 𝐵 → (𝐶 ↾ 𝐴) = (𝐶 ↾ 𝐵))
21rneqd 5013 . 2 (𝐴 = 𝐵 → ran (𝐶 ↾ 𝐴) = ran (𝐶 ↾ 𝐵))
3 df-ima 4789 . 2 (𝐶 “ 𝐴) = ran (𝐶 ↾ 𝐴)
4 df-ima 4789 . 2 (𝐶 “ 𝐵) = ran (𝐶 ↾ 𝐵)
52, 3, 43eqtr4g 2296 1 (𝐴 = 𝐵 → (𝐶 “ 𝐴) = (𝐶 “ 𝐵))
Colors of variables:    wff set class
This proof depends on syntax axioms:   → wi 4   = wceq 1402  ran crn 4777   ↾ cres 4778   “ cima 4779
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  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-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-sn 3715  df-pr 3716  df-op 3718  df-br 4132  df-opab 4194  df-xp 4782  df-cnv 4784  df-dm 4786  df-rn 4787  df-res 4788  df-ima 4789
This theorem is used by:  imaeq2i  5127  imaeq2d  5129  fimadmfo  5627  ssimaex  5767  ssimaexg  5768  isoselem  6029  f1opw2  6299  supp0cosupp0fn  6511  fopwdom  7142  ssenen  7158  fiintim  7244  fidcenumlemrk  7278  fidcenumlemr  7279  sbthlem2  7282  isbth  7291  ennnfonelemp1  13354  ennnfonelemnn0  13370  ctinfomlemom  13375  ctinfom  13376  tgcn  15451  iscnp4  15461  cnpnei  15462  cnima  15463  cnconst2  15476  cnrest2  15479  cnptoprest  15482  txcnp  15514  txcnmpt  15516  metcnp3  15754
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