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Theorem f1dm 5261
Description: The domain of a one-to-one mapping. (Contributed by set.mm contributors, 8-Mar-2014.)
Assertion
Ref Expression
f1dm

Proof of Theorem f1dm
StepHypRef Expression
1 f1fn 5259 . 2
2 fndm 5182 . 2
31, 2syl 15 1
Colors of variables: wff setvar class
Syntax hints:   wi 4   wceq 1642   cdm 4772   wfn 4776  wf1 4778
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 177  df-an 360  df-fn 4790  df-f 4791  df-f1 4792
This theorem is referenced by:  fun11iun  5305
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