Theorem ot3rdgg 6388

Description: Extract the third member of an ordered triple. (See ot1stg 6386 comment.) (Contributed by NM, 3-Apr-2015.)

Assertion

Ref	Expression
ot3rdgg	|- ( ( A e. V /\ B e. W /\ C e. X ) -> ( 2nd ` <. A , B , C >. ) = C )

Proof of Theorem ot3rdgg

Step	Hyp	Ref	Expression
1		df-ot 3719	. . 3 |- <. A , B , C >. = <. <. A , B >. , C >.
2	1	fveq2i 5698	. 2 |- ( 2nd ` <. A , B , C >. ) = ( 2nd ` <. <. A , B >. , C >. )
3		opexg 4368	. . . 4 |- ( ( A e. V /\ B e. W ) -> <. A , B >. e. _V )
4		op2ndg 6385	. . . 4 |- ( ( <. A , B >. e. _V /\ C e. X ) -> ( 2nd ` <. <. A , B >. , C >. ) = C )
5	3, 4	sylan 283	. . 3 |- ( ( ( A e. V /\ B e. W ) /\ C e. X ) -> ( 2nd ` <. <. A , B >. , C >. ) = C )
6	5	3impa 1225	. 2 |- ( ( A e. V /\ B e. W /\ C e. X ) -> ( 2nd ` <. <. A , B >. , C >. ) = C )
7	2, 6	eqtrid 2283	1 |- ( ( A e. V /\ B e. W /\ C e. X ) -> ( 2nd ` <. A , B , C >. ) = C )

This proof depends on syntax axioms:   -> wi 4   /\ wa 104   /\ w3a 1009   = wceq 1402   e. wcel 2209   _Vcvv 2821   <.cop 3712   <.cotp 3713   ` cfv 5377   2ndc2nd 6373

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4249  ax-pow 4311  ax-pr 4346  ax-un 4578

This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-sbc 3052  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-ot 3719  df-uni 3936  df-br 4131  df-opab 4193  df-mpt 4194  df-id 4438  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-iota 5337  df-fun 5379  df-fv 5385  df-2nd 6375

This theorem is used by: (None)