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Step * of Lemma strict4-concat-map

strict4(λx,y,z,w. concat(map(λb.y[b];x)))
BY
{ (ProveStrict THEN ExceptionCases (-1) THEN D 0 THEN Auto) }

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Latex:

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Latex:
strict4(\mlambda{}x,y,z,w.  concat(map(\mlambda{}b.y[b];x)))


By

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Latex:
(ProveStrict  THEN  ExceptionCases  (-1)  THEN  D  0  THEN  Auto)

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