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Step * of Lemma bag-map-null

∀f,bs:Top.  (null(bag-map(f;bs)) ~ null(bs))
BY
{ ((UnivCD THENA Auto) THEN RepUR ``bag-map`` 0 THEN RWO "null-map" 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}f,bs:Top.    (null(bag-map(f;bs))  \msim{}  null(bs))


By

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Latex:
((UnivCD  THENA  Auto)  THEN  RepUR  ``bag-map``  0  THEN  RWO  "null-map"  0  THEN  Auto)

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