Theorem axi4 2325

Description: Specialization (intuitionistic logic axiom ax-4). This is just sp 1747 by another name. (Contributed by Jim Kingdon, 31-Dec-2017.)

Assertion

Ref	Expression
axi4	|- (A.xph -> ph)

Proof of Theorem axi4

Step	Hyp	Ref	Expression
1		sp 1747	1 |- (A.xph -> ph)

Syntax hints:   -> wi 4  A.wal 1540

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-11 1746

This theorem depends on definitions:  df-bi 177  df-ex 1542

This theorem is referenced by: (None)