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Theorem pmtr3ncomlem2 17894
Description: Lemma 2 for pmtr3ncom 17895. (Contributed by AV, 17-Mar-2018.)
Hypotheses
Ref Expression
pmtr3ncom.t  |-  T  =  (pmTrsp `  D )
pmtr3ncom.f  |-  F  =  ( T `  { X ,  Y }
)
pmtr3ncom.g  |-  G  =  ( T `  { Y ,  Z }
)
Assertion
Ref Expression
pmtr3ncomlem2  |-  ( ( D  e.  V  /\  ( X  e.  D  /\  Y  e.  D  /\  Z  e.  D
)  /\  ( X  =/=  Y  /\  X  =/= 
Z  /\  Y  =/=  Z ) )  ->  ( G  o.  F )  =/=  ( F  o.  G
) )

Proof of Theorem pmtr3ncomlem2
StepHypRef Expression
1 pmtr3ncom.t . . 3  |-  T  =  (pmTrsp `  D )
2 pmtr3ncom.f . . 3  |-  F  =  ( T `  { X ,  Y }
)
3 pmtr3ncom.g . . 3  |-  G  =  ( T `  { Y ,  Z }
)
41, 2, 3pmtr3ncomlem1 17893 . 2  |-  ( ( D  e.  V  /\  ( X  e.  D  /\  Y  e.  D  /\  Z  e.  D
)  /\  ( X  =/=  Y  /\  X  =/= 
Z  /\  Y  =/=  Z ) )  ->  (
( G  o.  F
) `  X )  =/=  ( ( F  o.  G ) `  X
) )
5 fveq1 6190 . . 3  |-  ( ( G  o.  F )  =  ( F  o.  G )  ->  (
( G  o.  F
) `  X )  =  ( ( F  o.  G ) `  X ) )
65necon3i 2826 . 2  |-  ( ( ( G  o.  F
) `  X )  =/=  ( ( F  o.  G ) `  X
)  ->  ( G  o.  F )  =/=  ( F  o.  G )
)
74, 6syl 17 1  |-  ( ( D  e.  V  /\  ( X  e.  D  /\  Y  e.  D  /\  Z  e.  D
)  /\  ( X  =/=  Y  /\  X  =/= 
Z  /\  Y  =/=  Z ) )  ->  ( G  o.  F )  =/=  ( F  o.  G
) )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    /\ w3a 1037    = wceq 1483    e. wcel 1990    =/= wne 2794   {cpr 4179    o. ccom 5118   ` cfv 5888  pmTrspcpmtr 17861
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-3or 1038  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-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  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-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  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-om 7066  df-1o 7560  df-2o 7561  df-er 7742  df-en 7956  df-dom 7957  df-sdom 7958  df-fin 7959  df-pmtr 17862
This theorem is referenced by:  pmtr3ncom  17895
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