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Step * 1 of Lemma posint_mul_mon_wf


Assoc(ℕ+;λx,y. (x * y))
BY
{ UnfoldTopAb 0 THEN Reduce 0 THEN Auto }

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Latex:

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Latex:

Assoc(\mBbbN{}\msupplus{};\mlambda{}x,y.  (x  *  y))


By

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Latex:
UnfoldTopAb  0  THEN  Reduce  0  THEN  Auto

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