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Step * of Lemma bag-size-append

∀[as,bs:Top].  (#(as + bs) ~ #(as) + #(bs))
BY
{ (RepUR ``bag-size bag-append`` 0 THEN RWO "length-append" 0⋅ THEN Auto) }

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Latex:

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Latex:
\mforall{}[as,bs:Top].    (\#(as  +  bs)  \msim{}  \#(as)  +  \#(bs))


By

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Latex:
(RepUR  ``bag-size  bag-append``  0  THEN  RWO  "length-append"  0\mcdot{}  THEN  Auto)

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