Metamath Proof Explorer


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 baseid ⊢ Base = Slot Base ndx
2 1 str0 ⊢ ∅ = Base ∅