Theorem tbw-ax3 14169

Description: The third of four axioms in the Tarski-Bernays-Wajsberg system.

Assertion

Ref	Expression
tbw-ax3	|- (((ph -> ps) -> ph) -> ph)

Proof of Theorem tbw-ax3

Step	Hyp	Ref	Expression
1		peirce 98	1 |- (((ph -> ps) -> ph) -> ph)

Syntax hints:   -> wi 3

This theorem is referenced by:  tbwlem1 14172  tbwlem3 14174  re1luk2 14178

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7

Copyright terms: Public domain