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Theorem fvtp1g 6463
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
fvtp1g  |-  ( ( ( A  e.  V  /\  D  e.  W
)  /\  ( A  =/=  B  /\  A  =/= 
C ) )  -> 
( { <. A ,  D >. ,  <. B ,  E >. ,  <. C ,  F >. } `  A
)  =  D )

Proof of Theorem fvtp1g
StepHypRef Expression
1 df-tp 4182 . . 3  |-  { <. A ,  D >. ,  <. B ,  E >. ,  <. C ,  F >. }  =  ( { <. A ,  D >. ,  <. B ,  E >. }  u.  { <. C ,  F >. } )
21fveq1i 6192 . 2  |-  ( {
<. A ,  D >. , 
<. B ,  E >. , 
<. C ,  F >. } `
 A )  =  ( ( { <. A ,  D >. ,  <. B ,  E >. }  u.  {
<. C ,  F >. } ) `  A )
3 necom 2847 . . . . 5  |-  ( A  =/=  C  <->  C  =/=  A )
4 fvunsn 6445 . . . . 5  |-  ( C  =/=  A  ->  (
( { <. A ,  D >. ,  <. B ,  E >. }  u.  { <. C ,  F >. } ) `  A )  =  ( { <. A ,  D >. ,  <. B ,  E >. } `  A ) )
53, 4sylbi 207 . . . 4  |-  ( A  =/=  C  ->  (
( { <. A ,  D >. ,  <. B ,  E >. }  u.  { <. C ,  F >. } ) `  A )  =  ( { <. A ,  D >. ,  <. B ,  E >. } `  A ) )
65ad2antll 765 . . 3  |-  ( ( ( A  e.  V  /\  D  e.  W
)  /\  ( A  =/=  B  /\  A  =/= 
C ) )  -> 
( ( { <. A ,  D >. ,  <. B ,  E >. }  u.  {
<. C ,  F >. } ) `  A )  =  ( { <. A ,  D >. ,  <. B ,  E >. } `  A ) )
7 fvpr1g 6458 . . . . 5  |-  ( ( A  e.  V  /\  D  e.  W  /\  A  =/=  B )  -> 
( { <. A ,  D >. ,  <. B ,  E >. } `  A
)  =  D )
873expa 1265 . . . 4  |-  ( ( ( A  e.  V  /\  D  e.  W
)  /\  A  =/=  B )  ->  ( { <. A ,  D >. , 
<. B ,  E >. } `
 A )  =  D )
98adantrr 753 . . 3  |-  ( ( ( A  e.  V  /\  D  e.  W
)  /\  ( A  =/=  B  /\  A  =/= 
C ) )  -> 
( { <. A ,  D >. ,  <. B ,  E >. } `  A
)  =  D )
106, 9eqtrd 2656 . 2  |-  ( ( ( A  e.  V  /\  D  e.  W
)  /\  ( A  =/=  B  /\  A  =/= 
C ) )  -> 
( ( { <. A ,  D >. ,  <. B ,  E >. }  u.  {
<. C ,  F >. } ) `  A )  =  D )
112, 10syl5eq 2668 1  |-  ( ( ( A  e.  V  /\  D  e.  W
)  /\  ( A  =/=  B  /\  A  =/= 
C ) )  -> 
( { <. A ,  D >. ,  <. B ,  E >. ,  <. C ,  F >. } `  A
)  =  D )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    /\ wa 384    = wceq 1483    e. wcel 1990    =/= wne 2794    u. cun 3572   {csn 4177   {cpr 4179   {ctp 4181   <.cop 4183   ` cfv 5888
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-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  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-rab 2921  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-res 5126  df-iota 5851  df-fun 5890  df-fv 5896
This theorem is referenced by:  fvtp2g  6464  estrreslem1  16777
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