Theorem fococnv2 5660

Description: The composition of an onto function and its converse. (Contributed by Stefan O'Rear, 12-Feb-2015.)

Assertion

Ref	Expression
fococnv2	|- ( F : A -onto-> B -> ( F o. `' F ) = ( _I |` B ) )

Proof of Theorem fococnv2

Step	Hyp	Ref	Expression
1		fofun 5611	. . 3 |- ( F : A -onto-> B -> Fun F )
2		funcocnv2 5659	. . 3 |- ( Fun F -> ( F o. `' F ) = ( _I |` ran F ) )
3	1, 2	syl 14	. 2 |- ( F : A -onto-> B -> ( F o. `' F ) = ( _I |` ran F ) )
4		forn 5613	. . 3 |- ( F : A -onto-> B -> ran F = B )
5	4	reseq2d 5058	. 2 |- ( F : A -onto-> B -> ( _I |` ran F ) = ( _I |` B ) )
6	3, 5	eqtrd 2271	1 |- ( F : A -onto-> B -> ( F o. `' F ) = ( _I |` B ) )

Syntax hints:   -> wi 4   = wceq 1402   _I cid 4428   `'ccnv 4768   ran crn 4770   |` cres 4771   o. ccom 4773   Fun wfun 5366   -onto->wfo 5370

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

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-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-br 4126  df-opab 4188  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-res 4781  df-fun 5374  df-fn 5375  df-f 5376  df-fo 5378

This theorem is referenced by:  f1ococnv2  5661  foeqcnvco  5986