Theorem dmiin 4923

Description: Domain of an intersection. (Contributed by FL, 15-Oct-2012.)

Assertion

Ref	Expression
dmiin	|- dom |^|_ x e. A B C_ |^|_ x e. A dom B

Proof of Theorem dmiin

Step	Hyp	Ref	Expression
1		nfii1 3957	. . . 4 |- F/_ x |^|_ x e. A B
2	1	nfdm 4921	. . 3 |- F/_ x dom |^|_ x e. A B
3	2	ssiinf 3976	. 2 |- ( dom |^|_ x e. A B C_ |^|_ x e. A dom B <-> A. x e. A dom |^|_ x e. A B C_ dom B )
4		iinss2 3979	. . 3 |- ( x e. A -> |^|_ x e. A B C_ B )
5		dmss 4876	. . 3 |- ( |^|_ x e. A B C_ B -> dom |^|_ x e. A B C_ dom B )
6	4, 5	syl 14	. 2 |- ( x e. A -> dom |^|_ x e. A B C_ dom B )
7	3, 6	mprgbir 2563	1 |- dom |^|_ x e. A B C_ |^|_ x e. A dom B

Syntax hints:   e. wcel 2175   C_ wss 3165   |^|_ciin 3927   dom cdm 4674

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 710  ax-5 1469  ax-7 1470  ax-gen 1471  ax-ie1 1515  ax-ie2 1516  ax-8 1526  ax-10 1527  ax-11 1528  ax-i12 1529  ax-bndl 1531  ax-4 1532  ax-17 1548  ax-i9 1552  ax-ial 1556  ax-i5r 1557  ax-ext 2186

This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1375  df-nf 1483  df-sb 1785  df-clab 2191  df-cleq 2197  df-clel 2200  df-nfc 2336  df-ral 2488  df-v 2773  df-un 3169  df-in 3171  df-ss 3178  df-sn 3638  df-pr 3639  df-op 3641  df-iin 3929  df-br 4044  df-dm 4684

This theorem is referenced by: (None)