Theorem dfvd1impr 16487

Description: Right-to-left part of definition of virtual deduction.

Assertion

Ref	Expression
dfvd1impr	|- ((ph -> ps) -> . ph   ⊢   ps . )

Proof of Theorem dfvd1impr

Step	Hyp	Ref	Expression
1		df-vd1 16480	. 2 |- ( . ph   ⊢   ps . <-> (ph -> ps))
2	1	biimpri 169	1 |- ((ph -> ps) -> . ph   ⊢   ps . )

Syntax hints:   -> wi 3   . vd1 16479

This theorem is referenced by:  gen11 16511

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

This theorem depends on definitions:  df-bi 164  df-vd1 16480

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