Theorem coexg 5155

Description: The composition of two sets is a set. (Contributed by NM, 19-Mar-1998.)

Assertion

Ref	Expression
coexg	|- ( ( A e. V /\ B e. W ) -> ( A o. B ) e. _V )

Proof of Theorem coexg

Step	Hyp	Ref	Expression
1		cossxp 5133	. 2 |- ( A o. B ) C_ ( dom B X. ran A )
2		dmexg 4875	. . 3 |- ( B e. W -> dom B e. _V )
3		rnexg 4876	. . 3 |- ( A e. V -> ran A e. _V )
4		xpexg 4725	. . 3 |- ( ( dom B e. _V /\ ran A e. _V ) -> ( dom B X. ran A ) e. _V )
5	2, 3, 4	syl2anr 288	. 2 |- ( ( A e. V /\ B e. W ) -> ( dom B X. ran A ) e. _V )
6		ssexg 4128	. 2 |- ( ( ( A o. B ) C_ ( dom B X. ran A ) /\ ( dom B X. ran A ) e. _V ) -> ( A o. B ) e. _V )
7	1, 5, 6	sylancr 412	1 |- ( ( A e. V /\ B e. W ) -> ( A o. B ) e. _V )

Syntax hints:   -> wi 4   /\ wa 103   e. wcel 2141   _Vcvv 2730   C_ wss 3121   X. cxp 4609   dom cdm 4611   ran crn 4612   o. ccom 4615

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-13 2143  ax-14 2144  ax-ext 2152  ax-sep 4107  ax-pow 4160  ax-pr 4194  ax-un 4418

This theorem depends on definitions:  df-bi 116  df-3an 975  df-tru 1351  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ral 2453  df-rex 2454  df-v 2732  df-un 3125  df-in 3127  df-ss 3134  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-br 3990  df-opab 4051  df-xp 4617  df-rel 4618  df-cnv 4619  df-co 4620  df-dm 4621  df-rn 4622

This theorem is referenced by:  coex  5156  climcncf  13365