Metamath Proof Explorer


Theorem axi4

Description: Specialization (intuitionistic logic axiom ax-4). This is just sp by another name. (Contributed by Jim Kingdon, 31-Dec-2017) (New usage is discouraged.)

Ref Expression
Assertion axi4 ( ∀ 𝑥 𝜑𝜑 )

Proof

Step Hyp Ref Expression
1 sp ( ∀ 𝑥 𝜑𝜑 )