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Chapter 12: the slope problem (partial formalization) - #159

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@AItoBit AItoBit commented Oct 1, 2026

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Adds a partial formalization of Chapter 12 (the slope problem, pp. 83–87): directions between distinct points (including vertical), the signed-area / noncollinearity setup and related lemmas. The general Ungar bound is not asserted. No sorry.

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