Theorem enrefg 6980

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 5632	. . 3 |- ( _I |` A ) : A -1-1-onto-> A
2		f1oen2g 6971	. . 3 |- ( ( A e. V /\ A e. V /\ ( _I |` A ) : A -1-1-onto-> A ) -> A ~~ A )
3	1, 2	mp3an3 1363	. 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 2202   class class class wbr 4093   _I cid 4391   |` cres 4733   -1-1-onto->wf1o 5332   ~~ cen 6950

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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4212  ax-pow 4270  ax-pr 4305  ax-un 4536

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ral 2516  df-rex 2517  df-v 2805  df-un 3205  df-in 3207  df-ss 3214  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-uni 3899  df-br 4094  df-opab 4156  df-id 4396  df-xp 4737  df-rel 4738  df-cnv 4739  df-co 4740  df-dm 4741  df-rn 4742  df-res 4743  df-ima 4744  df-fun 5335  df-fn 5336  df-f 5337  df-f1 5338  df-fo 5339  df-f1o 5340  df-en 6953

This theorem is referenced by:  enref  6981  eqeng  6982  domrefg  6983  mapdom1g  7076  fidifsnen  7100  nnfi  7102  onenon  7448  oncardval  7450  cardonle  7451  dju1en  7488  xpdjuen  7493  iseqf1olemqf1o  10831  hashun  11131  lgseisenlem2  15890