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Step * of Lemma bag-size-map

∀[bs,f:Top].  (#(bag-map(f;bs)) ~ #(bs))
BY
{ (RepUR ``bag-size bag-map`` 0 THEN RWO "map-length" 0 THEN Auto) }

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Latex:

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


By

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Latex:
(RepUR  ``bag-size  bag-map``  0  THEN  RWO  "map-length"  0  THEN  Auto)

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