Theorem pm2.27 39

Description: This theorem, called "Assertion," can be thought of as closed form of modus ponens ax-mp 7. Theorem *2.27 of [WhiteheadRussell] p. 104. (Contributed by NM, 5-Aug-1993.)

Assertion

Ref	Expression
pm2.27	|- ( ph -> ( ( ph -> ps ) -> ps ) )

Proof of Theorem pm2.27

Step	Hyp	Ref	Expression
1		id 19	. 2 |- ( ( ph -> ps ) -> ( ph -> ps ) )
2	1	com12 30	1 |- ( ph -> ( ( ph -> ps ) -> ps ) )

Syntax hints:   -> wi 4

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

This theorem is referenced by:  pm2.43  52  com23  77  biimt  239  pm3.35  339  pm3.2im  599  mth8  612  pm2.65  618  condc  783  annimim  816  pm2.26dc  847  ax10o  1644  issref  4737  acexmidlem2  5540  findcard2  6423  findcard2s  6424  bj-inf2vnlem1  10923  bj-findis  10932