Metamath Proof Explorer


Theorem bnj564

Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011) (New usage is discouraged.)

Ref Expression
Hypothesis bnj564.17 No typesetting found for |- ( ta <-> ( f Fn m /\ ph' /\ ps' ) ) with typecode |-
Assertion bnj564 τ dom f = m

Proof

Step Hyp Ref Expression
1 bnj564.17 Could not format ( ta <-> ( f Fn m /\ ph' /\ ps' ) ) : No typesetting found for |- ( ta <-> ( f Fn m /\ ph' /\ ps' ) ) with typecode |-
2 1 simp1bi τ f Fn m
3 2 fndmd τ dom f = m