Step
*
of Lemma
lower-bound_wf
∀[A:Set(ℝ)]. ∀[b:ℝ].  (lower-bound(A;b) ∈ ℙ)
BY
{ (Unfold `lower-bound` 0 THEN Auto)⋅ }
Latex:
Latex:
\mforall{}[A:Set(\mBbbR{})].  \mforall{}[b:\mBbbR{}].    (lower-bound(A;b)  \mmember{}  \mBbbP{})
By
Latex:
(Unfold  `lower-bound`  0  THEN  Auto)\mcdot{}
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