Theorem cnven 7086

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 5320	. . 3 |- ( A e. V -> `' A e. _V )
3	2	adantl 277	. 2 |- ( ( Rel A /\ A e. V ) -> `' A e. _V )
4		cnvf1o 6451	. . 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 7031	. 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 1278	1 |- ( ( Rel A /\ A e. V ) -> A ~~ `' A )

Syntax hints:   -> wi 4   /\ wa 104   e. wcel 2209   _Vcvv 2821   {csn 3705   U.cuni 3930   class class class wbr 4125   |-> cmpt 4187   `'ccnv 4768   Rel wrel 4774   -1-1-onto->wf1o 5371   ~~ cen 7010

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 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341  ax-un 4573

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-sbc 3052  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-br 4126  df-opab 4188  df-mpt 4189  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-iota 5332  df-fun 5374  df-fn 5375  df-f 5376  df-f1 5377  df-fo 5378  df-f1o 5379  df-fv 5380  df-1st 6364  df-2nd 6365  df-en 7013

This theorem is referenced by:  cnvct  7087  relcnvfi  7245  lgsquadlem3  16112