Theorem ot3rdgg 6348

Description: Extract the third member of an ordered triple. (See ot1stg 6346 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 3699	. . 3 |- <. A , B , C >. = <. <. A , B >. , C >.
2	1	fveq2i 5673	. 2 |- ( 2nd ` <. A , B , C >. ) = ( 2nd ` <. <. A , B >. , C >. )
3		opexg 4344	. . . 4 |- ( ( A e. V /\ B e. W ) -> <. A , B >. e. _V )
4		op2ndg 6345	. . . 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 1221	. 2 |- ( ( A e. V /\ B e. W /\ C e. X ) -> ( 2nd ` <. <. A , B >. , C >. ) = C )
7	2, 6	eqtrid 2277	1 |- ( ( A e. V /\ B e. W /\ C e. X ) -> ( 2nd ` <. A , B , C >. ) = C )

Syntax hints:   -> wi 4   /\ wa 104   /\ w3a 1005   = wceq 1398   e. wcel 2203   _Vcvv 2813   <.cop 3692   <.cotp 3693   ` 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-ot 3699  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: (None)