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Theorem invinv 13668
Description: The inverse of the inverse of an isomorphism is itself. Proposition 3.14(1) of [Adamek] p. 29. (Contributed by Mario Carneiro, 2-Jan-2017.)
Hypotheses
Ref Expression
invfval.b  |-  B  =  ( Base `  C
)
invfval.n  |-  N  =  (Inv `  C )
invfval.c  |-  ( ph  ->  C  e.  Cat )
invfval.x  |-  ( ph  ->  X  e.  B )
invfval.y  |-  ( ph  ->  Y  e.  B )
isoval.n  |-  I  =  (  Iso  `  C
)
invinv.f  |-  ( ph  ->  F  e.  ( X I Y ) )
Assertion
Ref Expression
invinv  |-  ( ph  ->  ( ( Y N X ) `  (
( X N Y ) `  F ) )  =  F )

Proof of Theorem invinv
StepHypRef Expression
1 invfval.b . . . 4  |-  B  =  ( Base `  C
)
2 invfval.n . . . 4  |-  N  =  (Inv `  C )
3 invfval.c . . . 4  |-  ( ph  ->  C  e.  Cat )
4 invfval.x . . . 4  |-  ( ph  ->  X  e.  B )
5 invfval.y . . . 4  |-  ( ph  ->  Y  e.  B )
61, 2, 3, 4, 5invsym2 13661 . . 3  |-  ( ph  ->  `' ( X N Y )  =  ( Y N X ) )
76fveq1d 5488 . 2  |-  ( ph  ->  ( `' ( X N Y ) `  ( ( X N Y ) `  F
) )  =  ( ( Y N X ) `  ( ( X N Y ) `
 F ) ) )
8 isoval.n . . . 4  |-  I  =  (  Iso  `  C
)
91, 2, 3, 4, 5, 8invf1o 13667 . . 3  |-  ( ph  ->  ( X N Y ) : ( X I Y ) -1-1-onto-> ( Y I X ) )
10 invinv.f . . 3  |-  ( ph  ->  F  e.  ( X I Y ) )
11 f1ocnvfv1 5754 . . 3  |-  ( ( ( X N Y ) : ( X I Y ) -1-1-onto-> ( Y I X )  /\  F  e.  ( X I Y ) )  -> 
( `' ( X N Y ) `  ( ( X N Y ) `  F
) )  =  F )
129, 10, 11syl2anc 642 . 2  |-  ( ph  ->  ( `' ( X N Y ) `  ( ( X N Y ) `  F
) )  =  F )
137, 12eqtr3d 2318 1  |-  ( ph  ->  ( ( Y N X ) `  (
( X N Y ) `  F ) )  =  F )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1623    e. wcel 1685   `'ccnv 4687   -1-1-onto->wf1o 5220   ` cfv 5221  (class class class)co 5820   Basecbs 13144   Catccat 13562  Invcinv 13644    Iso ciso 13645
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1636  ax-8 1644  ax-13 1687  ax-14 1689  ax-6 1704  ax-7 1709  ax-11 1716  ax-12 1868  ax-ext 2265  ax-rep 4132  ax-sep 4142  ax-nul 4150  ax-pow 4187  ax-pr 4213  ax-un 4511
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1631  df-eu 2148  df-mo 2149  df-clab 2271  df-cleq 2277  df-clel 2280  df-nfc 2409  df-ne 2449  df-ral 2549  df-rex 2550  df-reu 2551  df-rmo 2552  df-rab 2553  df-v 2791  df-sbc 2993  df-csb 3083  df-dif 3156  df-un 3158  df-in 3160  df-ss 3167  df-nul 3457  df-if 3567  df-pw 3628  df-sn 3647  df-pr 3648  df-op 3650  df-uni 3829  df-iun 3908  df-br 4025  df-opab 4079  df-mpt 4080  df-id 4308  df-xp 4694  df-rel 4695  df-cnv 4696  df-co 4697  df-dm 4698  df-rn 4699  df-res 4700  df-ima 4701  df-fun 5223  df-fn 5224  df-f 5225  df-f1 5226  df-fo 5227  df-f1o 5228  df-fv 5229  df-ov 5823  df-oprab 5824  df-mpt2 5825  df-1st 6084  df-2nd 6085  df-iota 6253  df-riota 6300  df-cat 13566  df-cid 13567  df-sect 13646  df-inv 13647  df-iso 13648
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