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Step * of Lemma hd-nil

hd([]) ~ ⊥
BY
{ (RepUR ``hd nil it`` 0 THEN RWO "pi1-axiom" 0 THEN Auto) }

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Latex:

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Latex:
hd([])  \msim{}  \mbot{}


By

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Latex:
(RepUR  ``hd  nil  it``  0  THEN  RWO  "pi1-axiom"  0  THEN  Auto)

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