Notes
105.43 c2 = a2 + bd, a visual extension of the Pythagorean theorem
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- 13 October 2021, pp. 520-521
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105.44 A segment inside a square that is equal to the side of the square
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- 13 October 2021, pp. 522-523
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105.45 British flag theorem for isosceles trapezia
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- 13 October 2021, pp. 523-529
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105.46 Proximity of the incentre to the excentres and inequality for the circumcevians of the incentre
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- 13 October 2021, pp. 529-533
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105.47 On a synthetic proof for the conic sections orthoptics
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- 13 October 2021, pp. 533-538
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105.48 Approximations for the Feller games
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- 13 October 2021, pp. 539-543
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105.49 Equality in mathematics
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- 13 October 2021, pp. 544-548
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Correspondence
Correspondence
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- 13 October 2021, p. 549
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Feedback
On ‘On the frequency of Friday the thirteenth’
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- 13 October 2021, p. 550
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On 105.16
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- 13 October 2021, p. 550
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On 105.17 and 105.18
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- 13 October 2021, pp. 550-551
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On 105.19
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- 13 October 2021, p. 551
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On 105.23
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Problem Corner
Problem Corner
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- 13 October 2021, pp. 552-558
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Student Problems
Student Problems
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- 13 October 2021, pp. 559-561
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Reviews
The essence of mathematics through elementary problems by Alexandre Borovik and Tony Gardiner, pp 376, £18.95, ISBN 978-1-78374-699-6, Open Book Publishers (2019)
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- 13 October 2021, pp. 562-564
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The shape of a life by Shing-Tung Yau and Steve Nadis, pp. 293, $20 (hard), ISBN 978-0-399-23590-6, Yale University Press (2019)
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- 13 October 2021, pp. 564-566
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Perspective and projective geometry by Annalisa Crannell, Marc Frantz and Fumiko Futamura, pp. 280, £42 (paper), ISBN 978-0-69119-656-5, Princeton University Press (2019)
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- 13 October 2021, pp. 566-567
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Introduction to probability models (12th edn.) by Sheldon M. Ross, pp. 826, £92.95 (hard), ISBN 978-0-128-14346-9, Academic Press/Elsevier (2019)
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- 13 October 2021, p. 567
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Tales of impossibility by David S. Richeson, pp. 436, £25 (hard), ISBN 978-0-69119-296-3, Princeton University Press (2019)
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- 13 October 2021, pp. 568-569
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