Theorem cnven 7049

Description: A relational set is equinumerous to its converse. (Contributed by Mario Carneiro, 28-Dec-2014.)

Assertion

Ref	Expression
cnven	|- ( ( Rel A /\ A e. V ) -> A ~~ `' A )

Proof of Theorem cnven

Dummy variable x is distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpr 110	. 2 |- ( ( Rel A /\ A e. V ) -> A e. V )
2		cnvexg 5300	. . 3 |- ( A e. V -> `' A e. _V )
3	2	adantl 277	. 2 |- ( ( Rel A /\ A e. V ) -> `' A e. _V )
4		cnvf1o 6421	. . 3 |- ( Rel A -> ( x e. A |-> U. `' { x } ) : A -1-1-onto-> `' A )
5	4	adantr 276	. 2 |- ( ( Rel A /\ A e. V ) -> ( x e. A |-> U. `' { x } ) : A -1-1-onto-> `' A )
6		f1oen2g 6994	. 2 |- ( ( A e. V /\ `' A e. _V /\ ( x e. A |-> U. `' { x } ) : A -1-1-onto-> `' A ) -> A ~~ `' A )
7	1, 3, 5, 6	syl3anc 1274	1 |- ( ( Rel A /\ A e. V ) -> A ~~ `' A )

Syntax hints:   -> wi 4   /\ wa 104   e. wcel 2203   _Vcvv 2813   {csn 3689   U.cuni 3914   class class class wbr 4109   |-> cmpt 4171   `'ccnv 4748   Rel wrel 4754   -1-1-onto->wf1o 5351   ~~ cen 6973

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 2205  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-pow 4287  ax-pr 4322  ax-un 4554

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ral 2525  df-rex 2526  df-v 2815  df-sbc 3043  df-un 3215  df-in 3217  df-ss 3224  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-br 4110  df-opab 4172  df-mpt 4173  df-id 4414  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-rn 4760  df-iota 5312  df-fun 5354  df-fn 5355  df-f 5356  df-f1 5357  df-fo 5358  df-f1o 5359  df-fv 5360  df-1st 6334  df-2nd 6335  df-en 6976

This theorem is referenced by:  cnvct  7050  relcnvfi  7208  lgsquadlem3  15952