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Step * 1 1 of Lemma hd-map


1. f : Top
⊢ map(f;[])[0] ~ if null([]) then ⊥ else f [][0] fi 
BY
{ (Reduce 0 THEN Auto) }

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Latex:

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Latex:

1.  f  :  Top
\mvdash{}  map(f;[])[0]  \msim{}  if  null([])  then  \mbot{}  else  f  [][0]  fi 


By

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Latex:
(Reduce  0  THEN  Auto)

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