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Theorem tb-ax2 31549
Description: The second of three axioms in the Tarski-Bernays axiom system. (Contributed by Anthony Hart, 16-Aug-2011.) (Proof modification is discouraged.) (New usage is discouraged.)
Ref Expression
tb-ax2 (𝜑 → (𝜓𝜑))

Proof of Theorem tb-ax2
StepHypRef Expression
1 ax-1 6 1 (𝜑 → (𝜓𝜑))
Colors of variables: wff setvar class
Syntax hints:  wi 4
This theorem was proved from axioms:  ax-1 6
This theorem is referenced by:  re1ax2lem  31552
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