List questions from noneuclidean-geometry

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Book recommendations for Euclidean/Non-Euclidean Geometry

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Transitive parallel lines in noneuclidean-geometry

Published on 21 Mar 2026 - 20:42

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How many of the 32 potential geometric systems are actually useful or practical to study/understand?

Published on 22 Mar 2026 - 3:27

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How to derive Lobachevsky's formula for the angle of parallelism

Published on 22 Mar 2026 - 7:01

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Proof verification: Cross Ratio

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Confusion about Hyperbolic Geometry.

Published on 22 Mar 2026 - 9:00

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Cosine Law Duality in Hyperbolic Trigonometry

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Prove Ultraparallel Theorem in the half-plane model

Published on 22 Mar 2026 - 15:27

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Let A and B be two distinct points. Prove each of the following equalities. (a) ray AB ∪ ray BA = line AB (b) ray AB ∩ ray BA = line AB

Published on 22 Mar 2026 - 10:03

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Non-Euclidean Geometrical Algebra for Real times Real?

Published on 22 Mar 2026 - 13:07

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What is the difference between projective and elliptic geometry?

Published on 21 Mar 2026 - 17:40

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Isometries of the sphere - $S^2$.

Published on 21 Mar 2026 - 23:11

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what do terms like lines and angles mean after Euclid's parallel postulate is relaxed?

Published on 21 Mar 2026 - 22:10

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Bolyai's statement in "the Science of absolute space " paragraph 9

Published on 21 Mar 2026 - 17:46

List Question

What is the "most obtuse" triangle that can fit on a sphere?

Book recommendations for Euclidean/Non-Euclidean Geometry

Transitive parallel lines in noneuclidean-geometry

How many of the 32 potential geometric systems are actually useful or practical to study/understand?

How to derive Lobachevsky's formula for the angle of parallelism

Proof verification: Cross Ratio

Confusion about Hyperbolic Geometry.

Cosine Law Duality in Hyperbolic Trigonometry

Prove Ultraparallel Theorem in the half-plane model

Let A and B be two distinct points. Prove each of the following equalities. (a) ray AB ∪ ray BA = line AB (b) ray AB ∩ ray BA = line AB

Non-Euclidean Geometrical Algebra for Real times Real?

What is the difference between projective and elliptic geometry?

Isometries of the sphere - $S^2$.

what do terms like lines and angles mean after Euclid's parallel postulate is relaxed?

Bolyai's statement in "the Science of absolute space " paragraph 9

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