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Theorem eqeng 6907
Description: Equality implies equinumerosity. (Contributed by NM, 26-Oct-2003.)
Assertion
Ref Expression
eqeng (𝐴𝑉 → (𝐴 = 𝐵𝐴𝐵))

Proof of Theorem eqeng
StepHypRef Expression
1 enrefg 6905 . 2 (𝐴𝑉𝐴𝐴)
2 breq2 4086 . 2 (𝐴 = 𝐵 → (𝐴𝐴𝐴𝐵))
31, 2syl5ibcom 155 1 (𝐴𝑉 → (𝐴 = 𝐵𝐴𝐵))
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1395  wcel 2200   class class class wbr 4082  cen 6875
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-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4201  ax-pow 4257  ax-pr 4292  ax-un 4521
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-v 2801  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3888  df-br 4083  df-opab 4145  df-id 4381  df-xp 4722  df-rel 4723  df-cnv 4724  df-co 4725  df-dm 4726  df-rn 4727  df-res 4728  df-ima 4729  df-fun 5316  df-fn 5317  df-f 5318  df-f1 5319  df-fo 5320  df-f1o 5321  df-en 6878
This theorem is referenced by:  idssen  6918  nneneq  7006  exmidpw  7058  pr2ne  7353
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