Metamath Proof Explorer


Theorem bnj101

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

Ref Expression
Hypotheses bnj101.1 𝑥 𝜑
bnj101.2 ( 𝜑𝜓 )
Assertion bnj101 𝑥 𝜓

Proof

Step Hyp Ref Expression
1 bnj101.1 𝑥 𝜑
2 bnj101.2 ( 𝜑𝜓 )
3 1 2 eximii 𝑥 𝜓