Metamath Proof Explorer


Theorem iddii

Description: Version of a1ii with the hypotheses switched. The first hypothesis is redundant so this theorem should not normally appear in a proof. Inference associated with idd . (Contributed by SN, 1-Apr-2025) (New usage is discouraged.)

Ref Expression
Hypotheses iddii.1 φ
iddii.2 ψ
Assertion iddii ψ

Proof

Step Hyp Ref Expression
1 iddii.1 φ
2 iddii.2 ψ