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- A digon or bigon; a two-sided shape (especially in non-Euclidean geometry)
- 1895, W. Burnside, “Kinematics of Non-Euclidean Space”, in Proceedings of the Edinburgh Mathematical Society, page 46:
- If n planes be drawn through any axis of the right-vector, each of which makes angles π/n with the planes on either side of it, the whole of space is divided into n congruent figures which may be called biangles, the space between any two adjacent planes being easily seen to be continuous with the vertically opposite space between them.
- 1912, Proceedings of the Edinburgh Mathematical Society, Scottish Academic Press, page 35:
- Then the right biangle CABD and the oblique biangle CPND are equivalent since the triangles API and BNI are congruent.
- 2012 December 6, Gerold Prauss, “Kant and the Straight Biangle”, in Enno Rudolph; Ion-Olimpiu Stamatescu, editors, Philosophy, Mathematics and Modern Physics: A Dialogue, page 228:
- It is therefore natural to consider whether precisely this concept of a straight line, with which Kant11 too was familiar, is the reason why Kant in the one passage says that the concept of a straight biangle is free of contradiction.
digon — see digon