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Theorem fvtp2g 5816
Description: The value of a function with a domain of (at most) three elements. (Contributed by Alexander van der Vekens, 4-Dec-2017.)
Assertion
Ref Expression
fvtp2g  |-  ( ( ( B  e.  V  /\  E  e.  W
)  /\  ( A  =/=  B  /\  B  =/= 
C ) )  -> 
( { <. A ,  D >. ,  <. B ,  E >. ,  <. C ,  F >. } `  B
)  =  E )

Proof of Theorem fvtp2g
StepHypRef Expression
1 tprot 3736 . . 3  |-  { <. A ,  D >. ,  <. B ,  E >. ,  <. C ,  F >. }  =  { <. B ,  E >. ,  <. C ,  F >. ,  <. A ,  D >. }
21fveq1i 5600 . 2  |-  ( {
<. A ,  D >. , 
<. B ,  E >. , 
<. C ,  F >. } `
 B )  =  ( { <. B ,  E >. ,  <. C ,  F >. ,  <. A ,  D >. } `  B
)
3 necom 2462 . . . 4  |-  ( A  =/=  B  <->  B  =/=  A )
4 fvtp1g 5815 . . . . . 6  |-  ( ( ( B  e.  V  /\  E  e.  W
)  /\  ( B  =/=  C  /\  B  =/= 
A ) )  -> 
( { <. B ,  E >. ,  <. C ,  F >. ,  <. A ,  D >. } `  B
)  =  E )
54expcom 116 . . . . 5  |-  ( ( B  =/=  C  /\  B  =/=  A )  -> 
( ( B  e.  V  /\  E  e.  W )  ->  ( { <. B ,  E >. ,  <. C ,  F >. ,  <. A ,  D >. } `  B )  =  E ) )
65ancoms 268 . . . 4  |-  ( ( B  =/=  A  /\  B  =/=  C )  -> 
( ( B  e.  V  /\  E  e.  W )  ->  ( { <. B ,  E >. ,  <. C ,  F >. ,  <. A ,  D >. } `  B )  =  E ) )
73, 6sylanb 284 . . 3  |-  ( ( A  =/=  B  /\  B  =/=  C )  -> 
( ( B  e.  V  /\  E  e.  W )  ->  ( { <. B ,  E >. ,  <. C ,  F >. ,  <. A ,  D >. } `  B )  =  E ) )
87impcom 125 . 2  |-  ( ( ( B  e.  V  /\  E  e.  W
)  /\  ( A  =/=  B  /\  B  =/= 
C ) )  -> 
( { <. B ,  E >. ,  <. C ,  F >. ,  <. A ,  D >. } `  B
)  =  E )
92, 8eqtrid 2252 1  |-  ( ( ( B  e.  V  /\  E  e.  W
)  /\  ( A  =/=  B  /\  B  =/= 
C ) )  -> 
( { <. A ,  D >. ,  <. B ,  E >. ,  <. C ,  F >. } `  B
)  =  E )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    = wceq 1373    e. wcel 2178    =/= wne 2378   {ctp 3645   <.cop 3646   ` cfv 5290
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 615  ax-in2 616  ax-io 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-14 2181  ax-ext 2189  ax-sep 4178  ax-pow 4234  ax-pr 4269
This theorem depends on definitions:  df-bi 117  df-3or 982  df-3an 983  df-tru 1376  df-fal 1379  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2194  df-cleq 2200  df-clel 2203  df-nfc 2339  df-ne 2379  df-ral 2491  df-rex 2492  df-v 2778  df-sbc 3006  df-dif 3176  df-un 3178  df-in 3180  df-ss 3187  df-nul 3469  df-pw 3628  df-sn 3649  df-pr 3650  df-tp 3651  df-op 3652  df-uni 3865  df-br 4060  df-opab 4122  df-id 4358  df-xp 4699  df-rel 4700  df-cnv 4701  df-co 4702  df-dm 4703  df-res 4705  df-iota 5251  df-fun 5292  df-fv 5298
This theorem is referenced by:  fvtp3g  5817  imasplusg  13255
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