Axiom ax-ia3 108

Description: 'And' introduction. One of the axioms of propositional logic. (Contributed by Mario Carneiro, 31-Jan-2015.)

Assertion

Ref	Expression
ax-ia3	|- ( ph -> ( ps -> ( ph /\ ps ) ) )

Detailed syntax breakdown of Axiom ax-ia3

Step	Hyp	Ref	Expression
1		wph	. 2 wff ph
2		wps	. . 3 wff ps
3	1, 2	wa 104	. . 3 wff ( ph /\ ps )
4	2, 3	wi 4	. 2 wff ( ps -> ( ph /\ ps ) )
5	1, 4	wi 4	1 wff ( ph -> ( ps -> ( ph /\ ps ) ) )

This axiom is referenced by:  ex  115  pm3.2  139  pm5.54dc  918  pclem6  1374  xoranor  1377  ax10oe  1797  2pwuninelg  6283  dmaddpq  7377  dmmulpq  7378  ltsopr  7594  ax1hfs  14791