Theorem idinv 16449

Description: The inverse of the identity is the identity. Example 3.13 of [Adamek] p. 28. (Contributed by AV, 9-Apr-2017.)

Hypotheses

Ref	Expression
invid.b	|- B = ( Base ` C )
invid.i	|- I = ( Id ` C )
invid.c	|- ( ph -> C e. Cat )
invid.x	|- ( ph -> X e. B )

Assertion

Ref	Expression
idinv	|- ( ph -> ( ( X (Inv ` C ) X ) ` ( I ` X ) ) = ( I ` X ) )

Proof of Theorem idinv

Step	Hyp	Ref	Expression
1		invid.b	. . 3 |- B = ( Base ` C )
2		eqid 2622	. . 3 |- (Inv ` C ) = (Inv ` C )
3		invid.c	. . 3 |- ( ph -> C e. Cat )
4		invid.x	. . 3 |- ( ph -> X e. B )
5	1, 2, 3, 4, 4	invfun 16424	. 2 |- ( ph -> Fun ( X (Inv ` C ) X ) )
6		invid.i	. . 3 |- I = ( Id ` C )
7	1, 6, 3, 4	invid 16447	. 2 |- ( ph -> ( I ` X ) ( X (Inv ` C ) X ) ( I ` X ) )
8		funbrfv 6234	. 2 |- ( Fun ( X (Inv ` C ) X ) -> ( ( I ` X ) ( X (Inv ` C ) X ) ( I ` X ) -> ( ( X (Inv ` C ) X ) ` ( I ` X ) ) = ( I ` X ) ) )
9	5, 7, 8	sylc 65	1 |- ( ph -> ( ( X (Inv ` C ) X ) ` ( I ` X ) ) = ( I ` X ) )

Syntax hints:   -> wi 4   = wceq 1483   e. wcel 1990   class class class wbr 4653   Fun wfun 5882   ` cfv 5888  (class class class)co 6650   Basecbs 15857   Catccat 16325   Idccid 16326  Invcinv 16405

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-rep 4771  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-1st 7168  df-2nd 7169  df-cat 16329  df-cid 16330  df-sect 16407  df-inv 16408

This theorem is referenced by:  invisoinvl  16450