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Step * of Lemma even-plus-even

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∀[n,m:ℤ].  ↑isEven(n + m) supposing (↑isEven(m)) ∧ (↑isEven(n))
BY
{ ((RWO "isEven-add" 0 THEN Auto) THEN Unfold `same-parity` 0 THEN AutoSplit THEN EAuto 1) }

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Latex:

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Latex:
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\mforall{}[n,m:\mBbbZ{}].    \muparrow{}isEven(n  +  m)  supposing  (\muparrow{}isEven(m))  \mwedge{}  (\muparrow{}isEven(n))


By

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Latex:
((RWO  "isEven-add"  0  THEN  Auto)  THEN  Unfold  `same-parity`  0  THEN  AutoSplit  THEN  EAuto  1)

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