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comment Non congruent (spherical) quadrilateral with same angles
Hello Mark, thank you for your help. I'm not sure if I understand you correctly. First of all, the "fraternal twin parallelograms" you described above seem to be congruent since they differ just by a reflection in the plane (tell me if I'm wrong). Secondly, what do you mean here: "Now choose among that family of quadrilaterals two very small ones which are close to a pair of planar fraternal twin parallelograms, having a corner angle of 2πα." What exactly means "close to". Furthermore you write: "they will have very nearly equal areas and perimeters on the sphere". Can you tell me why?
Dec
4
asked Non congruent (spherical) quadrilateral with same angles
Nov
18
awarded  Popular Question
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15
accepted canonical form of finite rank operators
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12
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11
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11
comment Estimate of the expectation value
Thank you very much!!
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11
accepted Estimate of the expectation value
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11
asked Estimate of the expectation value
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5
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3
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9
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9
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4
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31
revised proving Orthonormal basis
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31
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28
accepted What is the hyperbolic plane equivalent to translation in euclidean space