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Theorem tbw-ax2 1666
Description: The second of four axioms in the Tarski-Bernays-Wajsberg system. (Contributed by Anthony Hart, 13-Aug-2011.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
tbw-ax2 (𝜑 → (𝜓𝜑))

Proof of Theorem tbw-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:  tbwlem1  1670  tbwlem3  1672  tbwlem5  1674  re1luk2  1676
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