Step
*
of Lemma
squash-test
∀[P:ℙ]. (P 
⇒
 (↓P))
BY
{ Auto }
Latex:
Latex:
\mforall{}[P:\mBbbP{}].  (P  {}\mRightarrow{}  (\mdownarrow{}P))
By
Latex:
Auto
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