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Theorem op1std 6054
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 5429 . 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 6052 . 2  |-  ( 1st `  <. A ,  B >. )  =  A
51, 4eqtrdi 2189 1  |-  ( C  =  <. A ,  B >.  ->  ( 1st `  C
)  =  A )
Colors of variables: wff set class
Syntax hints:    -> wi 4    = wceq 1332    e. wcel 1481   _Vcvv 2689   <.cop 3535   ` cfv 5131   1stc1st 6044
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 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-10 1484  ax-11 1485  ax-i12 1486  ax-bndl 1487  ax-4 1488  ax-13 1492  ax-14 1493  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122  ax-sep 4054  ax-pow 4106  ax-pr 4139  ax-un 4363
This theorem depends on definitions:  df-bi 116  df-3an 965  df-tru 1335  df-nf 1438  df-sb 1737  df-eu 2003  df-mo 2004  df-clab 2127  df-cleq 2133  df-clel 2136  df-nfc 2271  df-ral 2422  df-rex 2423  df-v 2691  df-sbc 2914  df-un 3080  df-in 3082  df-ss 3089  df-pw 3517  df-sn 3538  df-pr 3539  df-op 3541  df-uni 3745  df-br 3938  df-opab 3998  df-mpt 3999  df-id 4223  df-xp 4553  df-rel 4554  df-cnv 4555  df-co 4556  df-dm 4557  df-rn 4558  df-iota 5096  df-fun 5133  df-fv 5139  df-1st 6046
This theorem is referenced by:  xp1st  6071  sbcopeq1a  6093  csbopeq1a  6094  eloprabi  6102  mpomptsx  6103  dmmpossx  6105  fmpox  6106  fmpoco  6121  df1st2  6124  xporderlem  6136  xpf1o  6746  fisumcom2  11239  txbas  12466  cnmpt1st  12496  txhmeo  12527
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