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Is a straight line the shortest path?

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 08 February 2018, pp. 112

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Emmental squares are tasty

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 08 February 2018, pp. 1322

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Axes for symmetric convex curves

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 08 February 2018, pp. 2330

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A vintage Listener crossword

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 08 February 2018, pp. 3137

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Variations on a Japanese Temple theorem

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 08 February 2018, pp. 3849

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Fisher's Fratio illustrated graphically

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 08 February 2018, pp. 5062

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Fibonacci periods and multiples

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 08 February 2018, pp. 6376

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Discrete version of the Pythagorean theorem

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 08 February 2018, pp. 7788

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Notes
102.01 Hoyle, Bondi and me: a memoir

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 08 February 2018, pp. 8993

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102.02 Minimal sets for congruence classes

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 08 February 2018, pp. 9397

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102.03 When quadratic residues are squares

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 08 February 2018, pp. 97100

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102.04 On the series of Fibonacci reciprocals

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 08 February 2018, pp. 100102

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102.05 Remarks on Problem 100.I

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 08 February 2018, pp. 102104

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102.06 A new elementary proof of Euler's continued fractions

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 08 February 2018, pp. 105111

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102.07 Evaluating the probability integral by approximating exp(−x2)

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 08 February 2018, pp. 111113

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102.08 A method of evaluating ζ (2) and

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 08 February 2018, pp. 114121

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102.09 Measurement of polygons and circles

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 08 February 2018, pp. 121127

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102.10 Pythagoras' theorem: a proof by contradiction

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 08 February 2018, p. 128

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102.11 Four congruent right triangles

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 08 February 2018, pp. 129131

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102.12 On circles inscribed in an ellipse

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 08 February 2018, pp. 131132

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