Theorem dmiin 5023

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 4038	. . . 4 |- F/_ x |^|_ x e. A B
2	1	nfdm 5021	. . 3 |- F/_ x dom |^|_ x e. A B
3	2	ssiinf 4057	. 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 4060	. . 3 |- ( x e. A -> |^|_ x e. A B C_ B )
5		dmss 4975	. . 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 2608	1 |- dom |^|_ x e. A B C_ |^|_ x e. A dom B

Syntax hints:   e. wcel 2209   C_ wss 3220   |^|_ciin 4008   dom cdm 4769

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 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-ext 2220

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-sn 3711  df-pr 3712  df-op 3714  df-iin 4010  df-br 4126  df-dm 4779

This theorem is referenced by: (None)