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Definition df-vd1 27354
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 27353 . 2  wff  (. ph  ->.  ps
).
41, 2wi 6 . 2  wff  ( ph  ->  ps )
53, 4wb 178 1  wff  ( (.
ph 
->.  ps ).  <->  ( ph  ->  ps ) )
Colors of variables: wff set class
This definition is referenced by:  in1  27355  dfvd1ir  27357  dfvd1imp  27360  dfvd1impr  27361  dfvd2an  27367  dfvd3an  27379
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