Theorem enrefg 6913

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	|- ( A e. V -> A ~~ A )

Proof of Theorem enrefg

Step	Hyp	Ref	Expression
1		f1oi 5610	. . 3 |- ( _I |` A ) : A -1-1-onto-> A
2		f1oen2g 6904	. . 3 |- ( ( A e. V /\ A e. V /\ ( _I |` A ) : A -1-1-onto-> A ) -> A ~~ A )
3	1, 2	mp3an3 1360	. 2 |- ( ( A e. V /\ A e. V ) -> A ~~ A )
4	3	anidms 397	1 |- ( A e. V -> A ~~ A )

Syntax hints:   -> wi 4   e. wcel 2200   class class class wbr 4082   _I cid 4378   |` cres 4720   -1-1-onto->wf1o 5316   ~~ cen 6883

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 4523

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 4383  df-xp 4724  df-rel 4725  df-cnv 4726  df-co 4727  df-dm 4728  df-rn 4729  df-res 4730  df-ima 4731  df-fun 5319  df-fn 5320  df-f 5321  df-f1 5322  df-fo 5323  df-f1o 5324  df-en 6886

This theorem is referenced by:  enref  6914  eqeng  6915  domrefg  6916  mapdom1g  7004  fidifsnen  7028  nnfi  7030  onenon  7352  oncardval  7354  cardonle  7355  dju1en  7391  xpdjuen  7396  iseqf1olemqf1o  10723  hashun  11022  lgseisenlem2  15744