Analecta Curiosa

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372 articles
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An ancient generalization of the Pythagorean theorem
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Base58 versus Base85 encoding
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Base 32 and base 64 encoding
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Two kinds of QR codes: quick response and quadratic residue
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Bech32 encoding | Bose–Chaudhuri–Hocquenghem (BCH) codes
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Text case changes the size of QR codes
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Enumerating the points of a finite projective plane
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Area of the unit disk under a Möbius transformation
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Projective duality
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Cross ratio
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A simple function that comes up surprisingly often
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Applications of the Möbius transformation (1-z)/(1+x)
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The anti-Smith chart
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Gram matrix
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Tetrahedral analog of the Pythagorean theorem
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Graphing Japanese Prefectures
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Do perimeter and area determine a triangle?
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Planets & Platonic Solids: Kepler's Mysterium Cosmographicum
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Japanese polygon theorem
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Measuring cryptographic strength in liters of boiling water
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