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Step * of Lemma per-value-property

∀[x:per-value()]. uand(x ∈ Base;(x)↓)
BY
{ (Auto THEN DUand 0 THEN Auto THEN PerSetHD (-1)⋅ THEN Auto) }

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Latex:

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Latex:
\mforall{}[x:per-value()].  uand(x  \mmember{}  Base;(x)\mdownarrow{})


By

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Latex:
(Auto  THEN  DUand  0  THEN  Auto  THEN  PerSetHD  (-1)\mcdot{}  THEN  Auto)

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