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xy = cos (x + y) and other implicit equations that are surprisingly easy to plot

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 15 February 2024, pp. 111

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Singular matrices and pairwisetangent circles

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 15 February 2024, pp. 1219

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Infinitely many composites

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 15 February 2024, pp. 2026

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Relating constructions and properties through duality

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 15 February 2024, pp. 2735

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Some generalisations and extensions of a remarkable geometry puzzle

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 15 February 2024, pp. 3642

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Notice
In the Pipeline for July 2024

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 15 February 2024, p. 42

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A characterisation of regular ngons via (in)commensurability

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 15 February 2024, pp. 4352

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Extensions of Vittas’ Theorem

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 15 February 2024, pp. 5360

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The role of convexity in defining regular polyhedra

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 15 February 2024, pp. 6168

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Euler’s primeproducing polynomial revisited

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 15 February 2024, pp. 6977

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Problem Corner: Farewell to NJL

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 15 February 2024, p. 77

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ABCtriangles

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 15 February 2024, pp. 7883

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Patterns among square roots of the 2 × 2 identity matrix

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 15 February 2024, pp. 8493

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The Eureka theorem of Gauss

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 15 February 2024, pp. 94104

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A slowly evolving conical pendulum

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 15 February 2024, pp. 105110

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Walk on a grid

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 15 February 2024, pp. 111117

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Notes
108.01 A use of Pythagorean triples in a problem in elementary geometry

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 15 February 2024, pp. 118119

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108.02 Fermatlike equations for fractional parts

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 15 February 2024, pp. 120122

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108.03 Remarks on perfect powers

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 15 February 2024, pp. 122124

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108.04 Digital root analysis of Smith numbers

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 15 February 2024, pp. 124130

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