Theorem base0

Description: The base set of the empty structure. (Contributed by David A. Wheeler, 7-Jul-2016)

	Ref	Expression
Assertion	base0	⊢ ∅ = ( Base ‘ ∅ )

Proof

Step	Hyp	Ref	Expression
1		df-base	⊢ Base = Slot 1
2	1	str0	⊢ ∅ = ( Base ‘ ∅ )