Theorem cnvimass 4795

Description: A preimage under any class is included in the domain of the class. (Contributed by FL, 29-Jan-2007.)

Assertion

Ref	Expression
cnvimass	|- ( `' A " B ) C_ dom A

Proof of Theorem cnvimass

Step	Hyp	Ref	Expression
1		imassrn 4785	. 2 |- ( `' A " B ) C_ ran `' A
2		dfdm4 4628	. 2 |- dom A = ran `' A
3	1, 2	sseqtr4i 3059	1 |- ( `' A " B ) C_ dom A

Syntax hints:   C_ wss 2999   `'ccnv 4437   dom cdm 4438   ran crn 4439   "cima 4441

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-io 665  ax-5 1381  ax-7 1382  ax-gen 1383  ax-ie1 1427  ax-ie2 1428  ax-8 1440  ax-10 1441  ax-11 1442  ax-i12 1443  ax-bndl 1444  ax-4 1445  ax-14 1450  ax-17 1464  ax-i9 1468  ax-ial 1472  ax-i5r 1473  ax-ext 2070  ax-sep 3957  ax-pow 4009  ax-pr 4036

This theorem depends on definitions:  df-bi 115  df-3an 926  df-tru 1292  df-nf 1395  df-sb 1693  df-eu 1951  df-mo 1952  df-clab 2075  df-cleq 2081  df-clel 2084  df-nfc 2217  df-ral 2364  df-rex 2365  df-v 2621  df-un 3003  df-in 3005  df-ss 3012  df-pw 3431  df-sn 3452  df-pr 3453  df-op 3455  df-br 3846  df-opab 3900  df-xp 4444  df-cnv 4446  df-dm 4448  df-rn 4449  df-res 4450  df-ima 4451

This theorem is referenced by:  fvimacnvi  5413  elpreima  5418  fconst4m  5517  nn0supp  8725  fisumss  10784