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Theorem tbw-ax2 1466
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.)
Ref Expression
tbw-ax2 (φ → (ψφ))

Proof of Theorem tbw-ax2
StepHypRef Expression
1 ax-1 5 1 (φ → (ψφ))
Colors of variables: wff setvar class
Syntax hints:  wi 4
This theorem was proved from axioms:  ax-1 5
This theorem is referenced by:  tbwlem1  1470  tbwlem3  1472  tbwlem5  1474  re1luk2  1476
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