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Theorem invinv 13672
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 13665 . . 3  |-  ( ph  ->  `' ( X N Y )  =  ( Y N X ) )
76fveq1d 5527 . 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 13671 . . 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 5792 . . 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 2317 1  |-  ( ph  ->  ( ( Y N X ) `  (
( X N Y ) `  F ) )  =  F )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1623    e. wcel 1684   `'ccnv 4688   -1-1-onto->wf1o 5254   ` cfv 5255  (class class class)co 5858   Basecbs 13148   Catccat 13566  Invcinv 13648    Iso ciso 13649
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 1635  ax-8 1643  ax-13 1686  ax-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-rep 4131  ax-sep 4141  ax-nul 4149  ax-pow 4188  ax-pr 4214  ax-un 4512
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 1630  df-eu 2147  df-mo 2148  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-ral 2548  df-rex 2549  df-reu 2550  df-rmo 2551  df-rab 2552  df-v 2790  df-sbc 2992  df-csb 3082  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-nul 3456  df-if 3566  df-pw 3627  df-sn 3646  df-pr 3647  df-op 3649  df-uni 3828  df-iun 3907  df-br 4024  df-opab 4078  df-mpt 4079  df-id 4309  df-xp 4695  df-rel 4696  df-cnv 4697  df-co 4698  df-dm 4699  df-rn 4700  df-res 4701  df-ima 4702  df-iota 5219  df-fun 5257  df-fn 5258  df-f 5259  df-f1 5260  df-fo 5261  df-f1o 5262  df-fv 5263  df-ov 5861  df-oprab 5862  df-mpt2 5863  df-1st 6122  df-2nd 6123  df-riota 6304  df-cat 13570  df-cid 13571  df-sect 13650  df-inv 13651  df-iso 13652
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