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Step * of Lemma r2-det-identity

∀[p,q,r,t:ℝ^2].  (|pqr| = (|tqr| + |ptr| + |pqt|))
BY
{ (Auto THEN Unfold `r2-det` 0 THEN Auto) }

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Latex:

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Latex:
\mforall{}[p,q,r,t:\mBbbR{}\^{}2].    (|pqr|  =  (|tqr|  +  |ptr|  +  |pqt|))


By

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Latex:
(Auto  THEN  Unfold  `r2-det`  0  THEN  Auto)

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