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Step * 1 of Lemma set-part-greatest


1. s : coSet{i:l}
⊢ (set-part(s) ⊆ s)
BY
{ ((RWO "setsubset-iff" 0 THEN Auto) THEN RWO  "setmem-set-part" (-1) THEN Auto) }

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Latex:

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Latex:

1.  s  :  coSet\{i:l\}
\mvdash{}  (set-part(s)  \msubseteq{}  s)


By

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Latex:
((RWO  "setsubset-iff"  0  THEN  Auto)  THEN  RWO    "setmem-set-part"  (-1)  THEN  Auto)

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