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Theorem inviso2 15378
Description: If  G is an inverse to  F, then  G is an isomorphism. (Contributed by Mario Carneiro, 3-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
)
inviso1.1  |-  ( ph  ->  F ( X N Y ) G )
Assertion
Ref Expression
inviso2  |-  ( ph  ->  G  e.  ( Y I X ) )

Proof of Theorem inviso2
StepHypRef Expression
1 invfval.b . 2  |-  B  =  ( Base `  C
)
2 invfval.n . 2  |-  N  =  (Inv `  C )
3 invfval.c . 2  |-  ( ph  ->  C  e.  Cat )
4 invfval.y . 2  |-  ( ph  ->  Y  e.  B )
5 invfval.x . 2  |-  ( ph  ->  X  e.  B )
6 isoval.n . 2  |-  I  =  (  Iso  `  C
)
7 inviso1.1 . . 3  |-  ( ph  ->  F ( X N Y ) G )
81, 2, 3, 5, 4invsym 15373 . . 3  |-  ( ph  ->  ( F ( X N Y ) G  <-> 
G ( Y N X ) F ) )
97, 8mpbid 210 . 2  |-  ( ph  ->  G ( Y N X ) F )
101, 2, 3, 4, 5, 6, 9inviso1 15377 1  |-  ( ph  ->  G  e.  ( Y I X ) )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    = wceq 1405    e. wcel 1842   class class class wbr 4394   ` cfv 5568  (class class class)co 6277   Basecbs 14839   Catccat 15276  Invcinv 15356    Iso ciso 15357
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1639  ax-4 1652  ax-5 1725  ax-6 1771  ax-7 1814  ax-8 1844  ax-9 1846  ax-10 1861  ax-11 1866  ax-12 1878  ax-13 2026  ax-ext 2380  ax-rep 4506  ax-sep 4516  ax-nul 4524  ax-pow 4571  ax-pr 4629  ax-un 6573
This theorem depends on definitions:  df-bi 185  df-or 368  df-an 369  df-3an 976  df-tru 1408  df-ex 1634  df-nf 1638  df-sb 1764  df-eu 2242  df-mo 2243  df-clab 2388  df-cleq 2394  df-clel 2397  df-nfc 2552  df-ne 2600  df-ral 2758  df-rex 2759  df-reu 2760  df-rmo 2761  df-rab 2762  df-v 3060  df-sbc 3277  df-csb 3373  df-dif 3416  df-un 3418  df-in 3420  df-ss 3427  df-nul 3738  df-if 3885  df-pw 3956  df-sn 3972  df-pr 3974  df-op 3978  df-uni 4191  df-iun 4272  df-br 4395  df-opab 4453  df-mpt 4454  df-id 4737  df-xp 4828  df-rel 4829  df-cnv 4830  df-co 4831  df-dm 4832  df-rn 4833  df-res 4834  df-ima 4835  df-iota 5532  df-fun 5570  df-fn 5571  df-f 5572  df-f1 5573  df-fo 5574  df-f1o 5575  df-fv 5576  df-riota 6239  df-ov 6280  df-oprab 6281  df-mpt2 6282  df-1st 6783  df-2nd 6784  df-cat 15280  df-cid 15281  df-sect 15358  df-inv 15359  df-iso 15360
This theorem is referenced by:  yonffthlem  15873
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