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Step * of Lemma int-triangle-inequality

∀[a,b:ℤ].  (|a + b| ≤ (|a| + |b|))
BY
{ (Auto THEN RWO "absval_unfold" 0 THEN Repeat (AutoSplit) THEN Auto) }

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Latex:

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Latex:
\mforall{}[a,b:\mBbbZ{}].    (|a  +  b|  \mleq{}  (|a|  +  |b|))


By

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Latex:
(Auto  THEN  RWO  "absval\_unfold"  0  THEN  Repeat  (AutoSplit)  THEN  Auto)

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