Theorem fdmi 5481

Description: The domain of a mapping. (Contributed by NM, 28-Jul-2008.)

Hypothesis

Ref	Expression
fdmi.1	|- F : A --> B

Assertion

Ref	Expression
fdmi	|- dom F = A

Proof of Theorem fdmi

Step	Hyp	Ref	Expression
1		fdmi.1	. 2 |- F : A --> B
2		fdm 5479	. 2 |- ( F : A --> B -> dom F = A )
3	1, 2	ax-mp 5	1 |- dom F = A

Syntax hints:   = wceq 1395   dom cdm 4719   -->wf 5314

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107

This theorem depends on definitions:  df-bi 117  df-fn 5321  df-f 5322

This theorem is referenced by:  suplocexprlemdisj  7918  suplocexprlemub  7921  eluzel2  9738  inftonninf  10676  qtopbasss  15210  retopbas  15212  tgqioo  15244  dvexp  15400  efcn  15457  pilem3  15472