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Step * of Lemma null-strict

∀[a:Base]. (a)↓ supposing (null(a))↓
BY
{ (Auto THEN RepUR ``null`` -1 THEN HasValueD (-1) THEN Trivial) }

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Latex:

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Latex:
\mforall{}[a:Base].  (a)\mdownarrow{}  supposing  (null(a))\mdownarrow{}


By

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Latex:
(Auto  THEN  RepUR  ``null``  -1  THEN  HasValueD  (-1)  THEN  Trivial)

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