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Theorem tb-ax2 24818
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.)
Assertion
Ref Expression
tb-ax2  |-  ( ph  ->  ( ps  ->  ph )
)

Proof of Theorem tb-ax2
StepHypRef Expression
1 ax-1 5 1  |-  ( ph  ->  ( ps  ->  ph )
)
Colors of variables: wff set class
Syntax hints:    -> wi 4
This theorem is referenced by:  re1ax2lem  24821
This theorem was proved from axioms:  ax-1 5
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