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Theorem op1std 6116
Description: Extract the first member of an ordered pair. (Contributed by Mario Carneiro, 31-Aug-2015.)
Hypotheses
Ref Expression
op1st.1  |-  A  e. 
_V
op1st.2  |-  B  e. 
_V
Assertion
Ref Expression
op1std  |-  ( C  =  <. A ,  B >.  ->  ( 1st `  C
)  =  A )

Proof of Theorem op1std
StepHypRef Expression
1 fveq2 5486 . 2  |-  ( C  =  <. A ,  B >.  ->  ( 1st `  C
)  =  ( 1st `  <. A ,  B >. ) )
2 op1st.1 . . 3  |-  A  e. 
_V
3 op1st.2 . . 3  |-  B  e. 
_V
42, 3op1st 6114 . 2  |-  ( 1st `  <. A ,  B >. )  =  A
51, 4eqtrdi 2215 1  |-  ( C  =  <. A ,  B >.  ->  ( 1st `  C
)  =  A )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1343    e. wcel 2136   _Vcvv 2726   <.cop 3579   ` cfv 5188   1stc1st 6106
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-sep 4100  ax-pow 4153  ax-pr 4187  ax-un 4411
This theorem depends on definitions:  df-bi 116  df-3an 970  df-tru 1346  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ral 2449  df-rex 2450  df-v 2728  df-sbc 2952  df-un 3120  df-in 3122  df-ss 3129  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-br 3983  df-opab 4044  df-mpt 4045  df-id 4271  df-xp 4610  df-rel 4611  df-cnv 4612  df-co 4613  df-dm 4614  df-rn 4615  df-iota 5153  df-fun 5190  df-fv 5196  df-1st 6108
This theorem is referenced by:  xp1st  6133  sbcopeq1a  6155  csbopeq1a  6156  eloprabi  6164  mpomptsx  6165  dmmpossx  6167  fmpox  6168  fmpoco  6184  df1st2  6187  xporderlem  6199  xpf1o  6810  fisumcom2  11379  fprodcom2fi  11567  txbas  12898  cnmpt1st  12928  txhmeo  12959
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