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Definition df-vd1 30981
Description: Definition of virtual deduction. (Contributed by Alan Sare, 21-Apr-2011.) (New usage is discouraged.)
Assertion
Ref Expression
df-vd1  |-  ( (.
ph 
->.  ps ).  <->  ( ph  ->  ps ) )

Detailed syntax breakdown of Definition df-vd1
StepHypRef Expression
1 wph . . 3  wff  ph
2 wps . . 3  wff  ps
31, 2wvd1 30980 . 2  wff  (. ph  ->.  ps
).
41, 2wi 4 . 2  wff  ( ph  ->  ps )
53, 4wb 184 1  wff  ( (.
ph 
->.  ps ).  <->  ( ph  ->  ps ) )
Colors of variables: wff setvar class
This definition is referenced by:  in1  30982  dfvd1ir  30984  dfvd1imp  30987  dfvd1impr  30988  dfvd2an  30994  dfvd3an  31006
  Copyright terms: Public domain W3C validator