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Step * of Lemma int-triangle-inequality2

∀[a,b:ℤ].  (|a - b| ≤ (|a| + |b|))
BY
{ (Auto THEN Unfold `subtract` 0 THEN RWO "int-triangle-inequality" 0 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  Unfold  `subtract`  0  THEN  RWO  "int-triangle-inequality"  0  THEN  Auto)

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