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Step * of Lemma strictness-subtract-left

∀[a:Top]. (⊥ - a ~ ⊥)
BY
{ (Unfold `subtract` 0 THEN SqReasoning THEN Assert ⌜(⊥)↓⌝⋅ THEN BotDiv) }

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Latex:

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Latex:
\mforall{}[a:Top].  (\mbot{}  -  a  \msim{}  \mbot{})


By

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Latex:
(Unfold  `subtract`  0  THEN  SqReasoning  THEN  Assert  \mkleeneopen{}(\mbot{})\mdownarrow{}\mkleeneclose{}\mcdot{}  THEN  BotDiv)

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