Theorem op2ndd 6343

Description: Extract the second 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
op2ndd	|- ( C = <. A , B >. -> ( 2nd ` C ) = B )

Proof of Theorem op2ndd

Step	Hyp	Ref	Expression
1		fveq2 5670	. 2 |- ( C = <. A , B >. -> ( 2nd ` C ) = ( 2nd ` <. A , B >. ) )
2		op1st.1	. . 3 |- A e. _V
3		op1st.2	. . 3 |- B e. _V
4	2, 3	op2nd 6341	. 2 |- ( 2nd ` <. A , B >. ) = B
5	1, 4	eqtrdi 2281	1 |- ( C = <. A , B >. -> ( 2nd ` C ) = B )

Syntax hints:   -> wi 4   = wceq 1398   e. wcel 2203   _Vcvv 2813   <.cop 3692   ` cfv 5352   2ndc2nd 6333

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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2205  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-pow 4287  ax-pr 4322  ax-un 4554

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ral 2525  df-rex 2526  df-v 2815  df-sbc 3043  df-un 3215  df-in 3217  df-ss 3224  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-br 4110  df-opab 4172  df-mpt 4173  df-id 4414  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-rn 4760  df-iota 5312  df-fun 5354  df-fv 5360  df-2nd 6335

This theorem is referenced by:  xp2nd  6360  sbcopeq1a  6381  csbopeq1a  6382  eloprabi  6392  mpomptsx  6393  dmmpossx  6395  fmpox  6396  fmpoco  6412  df2nd2  6416  xporderlem  6427  xpf1o  7097  mapunen  7104  frecuzrdgtcl  10774  frecuzrdgfunlem  10781  fisumcom2  12124  fprodcom2fi  12312  txbas  15123  cnmpt2nd  15154  txhmeo  15184