Theorem nssdmovg 6816

Description: The value of an operation outside its domain. (Contributed by Alexander van der Vekens, 7-Sep-2017.)

Assertion

Ref	Expression
nssdmovg	|- ( ( dom F C_ ( R X. S ) /\ -. ( A e. R /\ B e. S ) ) -> ( A F B ) = (/) )

Proof of Theorem nssdmovg

Step	Hyp	Ref	Expression
1		df-ov 6653	. 2 |- ( A F B ) = ( F ` <. A , B >. )
2		ssel2 3598	. . . . 5 |- ( ( dom F C_ ( R X. S ) /\ <. A , B >. e. dom F ) -> <. A , B >. e. ( R X. S ) )
3		opelxp 5146	. . . . 5 |- ( <. A , B >. e. ( R X. S ) <-> ( A e. R /\ B e. S ) )
4	2, 3	sylib 208	. . . 4 |- ( ( dom F C_ ( R X. S ) /\ <. A , B >. e. dom F ) -> ( A e. R /\ B e. S ) )
5	4	stoic1a 1697	. . 3 |- ( ( dom F C_ ( R X. S ) /\ -. ( A e. R /\ B e. S ) ) -> -. <. A , B >. e. dom F )
6		ndmfv 6218	. . 3 |- ( -. <. A , B >. e. dom F -> ( F ` <. A , B >. ) = (/) )
7	5, 6	syl 17	. 2 |- ( ( dom F C_ ( R X. S ) /\ -. ( A e. R /\ B e. S ) ) -> ( F ` <. A , B >. ) = (/) )
8	1, 7	syl5eq 2668	1 |- ( ( dom F C_ ( R X. S ) /\ -. ( A e. R /\ B e. S ) ) -> ( A F B ) = (/) )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 384   = wceq 1483   e. wcel 1990   C_ wss 3574   (/)c0 3915   <.cop 4183   X. cxp 5112   dom cdm 5114   ` cfv 5888  (class class class)co 6650

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-xp 5120  df-dm 5124  df-iota 5851  df-fv 5896  df-ov 6653

This theorem is referenced by:  mpt2ndm0  6875