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Theorem enrefg 8541
Description: Equinumerosity is reflexive. Theorem 1 of [Suppes] p. 92. (Contributed by NM, 18-Jun-1998.) (Revised by Mario Carneiro, 26-Apr-2015.)
Assertion
Ref Expression
enrefg (𝐴𝑉𝐴𝐴)

Proof of Theorem enrefg
StepHypRef Expression
1 f1oi 6652 . . 3 ( I ↾ 𝐴):𝐴1-1-onto𝐴
2 f1oen2g 8526 . . 3 ((𝐴𝑉𝐴𝑉 ∧ ( I ↾ 𝐴):𝐴1-1-onto𝐴) → 𝐴𝐴)
31, 2mp3an3 1446 . 2 ((𝐴𝑉𝐴𝑉) → 𝐴𝐴)
43anidms 569 1 (𝐴𝑉𝐴𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wcel 2114   class class class wbr 5066   I cid 5459  cres 5557  1-1-ontowf1o 6354  cen 8506
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-sep 5203  ax-nul 5210  ax-pow 5266  ax-pr 5330  ax-un 7461
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3496  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4839  df-br 5067  df-opab 5129  df-id 5460  df-xp 5561  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-rn 5566  df-res 5567  df-ima 5568  df-fun 6357  df-fn 6358  df-f 6359  df-f1 6360  df-fo 6361  df-f1o 6362  df-en 8510
This theorem is referenced by:  enref  8542  eqeng  8543  domrefg  8544  difsnen  8599  sdomirr  8654  mapdom1  8682  mapdom2  8688  onfin  8709  ssnnfi  8737  rneqdmfinf1o  8800  infdifsn  9120  infdiffi  9121  onenon  9378  cardonle  9386  dju1en  9597  xpdjuen  9605  mapdjuen  9606  onadju  9619  ssfin4  9732  canthp1lem1  10074  gchhar  10101  hashfac  13817  mreexexlem3d  16917  cyggenod  19003  fidomndrnglem  20079  mdetunilem8  21228  frlmpwfi  39718  fiuneneq  39817  enrelmap  40363
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