Theorem imassrn 4679

Description: The image of a class is a subset of its range. Theorem 3.16(xi) of [Monk1] p. 39. (Contributed by NM, 31-Mar-1995.)

Assertion

Ref	Expression
imassrn	|- ( A " B ) C_ ran A

Proof of Theorem imassrn

Dummy variables x y are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		exsimpr 1509	. . 3 |- ( E. x ( x e. B /\ <. x , y >. e. A ) -> E. x <. x , y >. e. A )
2	1	ss2abi 3012	. 2 |- { y | E. x ( x e. B /\ <. x , y >. e. A ) } C_ { y | E. x <. x , y >. e. A }
3		dfima3 4671	. 2 |- ( A " B ) = { y | E. x ( x e. B /\ <. x , y >. e. A ) }
4		dfrn3 4524	. 2 |- ran A = { y | E. x <. x , y >. e. A }
5	2, 3, 4	3sstr4i 2984	1 |- ( A " B ) C_ ran A

Syntax hints:   /\ wa 97   E.wex 1381   e. wcel 1393   {cab 2026   C_ wss 2917   <.cop 3378   ran crn 4346   "cima 4348

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-14 1405  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022  ax-sep 3875  ax-pow 3927  ax-pr 3944

This theorem depends on definitions:  df-bi 110  df-3an 887  df-tru 1246  df-nf 1350  df-sb 1646  df-eu 1903  df-mo 1904  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-ral 2311  df-rex 2312  df-v 2559  df-un 2922  df-in 2924  df-ss 2931  df-pw 3361  df-sn 3381  df-pr 3382  df-op 3384  df-br 3765  df-opab 3819  df-xp 4351  df-cnv 4353  df-dm 4355  df-rn 4356  df-res 4357  df-ima 4358

This theorem is referenced by:  imaexg  4680  0ima  4685  cnvimass  4688  fimacnv  5296  f1opw2  5706  smores2  5909  ecss  6147  f1imaen2g  6273  fopwdom  6310  phplem4dom  6324