Theorem op2ndd 5776

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 5178	. 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 5774	. 2 |- ( 2nd ` <. A , B >. ) = B
5	1, 4	syl6eq 2088	1 |- ( C = <. A , B >. -> ( 2nd ` C ) = B )

Syntax hints:   -> wi 4   = wceq 1243   e. wcel 1393   _Vcvv 2557   <.cop 3378   ` cfv 4902   2ndc2nd 5766

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-13 1404  ax-14 1405  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022  ax-sep 3875  ax-pow 3927  ax-pr 3944  ax-un 4170

This theorem depends on definitions:  df-bi 110  df-3an 887  df-tru 1246  df-nf 1350  df-sb 1646  df-eu 1903  df-mo 1904  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-ral 2311  df-rex 2312  df-v 2559  df-sbc 2765  df-un 2922  df-in 2924  df-ss 2931  df-pw 3361  df-sn 3381  df-pr 3382  df-op 3384  df-uni 3581  df-br 3765  df-opab 3819  df-mpt 3820  df-id 4030  df-xp 4351  df-rel 4352  df-cnv 4353  df-co 4354  df-dm 4355  df-rn 4356  df-iota 4867  df-fun 4904  df-fv 4910  df-2nd 5768

This theorem is referenced by:  xp2nd  5793  sbcopeq1a  5813  csbopeq1a  5814  eloprabi  5822  mpt2mptsx  5823  dmmpt2ssx  5825  fmpt2x  5826  fmpt2co  5837  df2nd2  5841  xporderlem  5852  frecuzrdgfn  9198