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Theorem i1i2con1 268
Description: Correspondence between Sasaki and Dishkant conditionals. (Contributed by NM, 28-Feb-1999.)
Assertion
Ref Expression
i1i2con1 (a1 b ) = (b2 a )

Proof of Theorem i1i2con1
StepHypRef Expression
1 i1i2 266 . 2 (a1 b ) = (b 2 a )
2 ax-a1 30 . . . 4 b = b
32ax-r1 35 . . 3 b = b
43ud2lem0b 259 . 2 (b 2 a ) = (b2 a )
51, 4ax-r2 36 1 (a1 b ) = (b2 a )
Colors of variables: term
Syntax hints:   = wb 1   wn 4  1 wi1 12  2 wi2 13
This theorem was proved from axioms:  ax-a1 30  ax-a2 31  ax-r1 35  ax-r2 36  ax-r4 37  ax-r5 38
This theorem depends on definitions:  df-a 40  df-i1 44  df-i2 45
This theorem is referenced by: (None)
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