Theorem op1std 6039

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

Step	Hyp	Ref	Expression
1		fveq2 5414	. 2 |- ( C = <. A , B >. -> ( 1st ` C ) = ( 1st ` <. A , B >. ) )
2		op1st.1	. . 3 |- A e. _V
3		op1st.2	. . 3 |- B e. _V
4	2, 3	op1st 6037	. 2 |- ( 1st ` <. A , B >. ) = A
5	1, 4	syl6eq 2186	1 |- ( C = <. A , B >. -> ( 1st ` C ) = A )

Syntax hints:   -> wi 4   = wceq 1331   e. wcel 1480   _Vcvv 2681   <.cop 3525   ` cfv 5118   1stc1st 6029

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 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-13 1491  ax-14 1492  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2119  ax-sep 4041  ax-pow 4093  ax-pr 4126  ax-un 4350

This theorem depends on definitions:  df-bi 116  df-3an 964  df-tru 1334  df-nf 1437  df-sb 1736  df-eu 2000  df-mo 2001  df-clab 2124  df-cleq 2130  df-clel 2133  df-nfc 2268  df-ral 2419  df-rex 2420  df-v 2683  df-sbc 2905  df-un 3070  df-in 3072  df-ss 3079  df-pw 3507  df-sn 3528  df-pr 3529  df-op 3531  df-uni 3732  df-br 3925  df-opab 3985  df-mpt 3986  df-id 4210  df-xp 4540  df-rel 4541  df-cnv 4542  df-co 4543  df-dm 4544  df-rn 4545  df-iota 5083  df-fun 5120  df-fv 5126  df-1st 6031

This theorem is referenced by:  xp1st  6056  sbcopeq1a  6078  csbopeq1a  6079  eloprabi  6087  mpomptsx  6088  dmmpossx  6090  fmpox  6091  fmpoco  6106  df1st2  6109  xporderlem  6121  xpf1o  6731  fisumcom2  11200  txbas  12416  cnmpt1st  12446  txhmeo  12477