Theorem op1std 6294

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 5627	. 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 6292	. 2 |- ( 1st ` <. A , B >. ) = A
5	1, 4	eqtrdi 2278	1 |- ( C = <. A , B >. -> ( 1st ` C ) = A )

Syntax hints:   -> wi 4   = wceq 1395   e. wcel 2200   _Vcvv 2799   <.cop 3669   ` cfv 5318   1stc1st 6284

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-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4202  ax-pow 4258  ax-pr 4293  ax-un 4524

This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-v 2801  df-sbc 3029  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3889  df-br 4084  df-opab 4146  df-mpt 4147  df-id 4384  df-xp 4725  df-rel 4726  df-cnv 4727  df-co 4728  df-dm 4729  df-rn 4730  df-iota 5278  df-fun 5320  df-fv 5326  df-1st 6286

This theorem is referenced by:  xp1st  6311  sbcopeq1a  6333  csbopeq1a  6334  eloprabi  6342  mpomptsx  6343  dmmpossx  6345  fmpox  6346  fmpoco  6362  df1st2  6365  xporderlem  6377  xpf1o  7005  fisumcom2  11949  fprodcom2fi  12137  txbas  14932  cnmpt1st  14962  txhmeo  14993  lgsquadlem1  15756  lgsquadlem2  15757