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Removing a vertex from a tetrahedron
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- 13 March 2015, pp. 90-96
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Matters for Debate
An audited elementary algebra
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- 10 July 2015, pp. 298-316
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Differential equations v. power series
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- 02 November 2015, pp. 499-503
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99.12 Primitive integer triangles
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- 10 July 2015, pp. 317-319
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Variations on a sangaku problem involving kissing spheres
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- 02 November 2015, pp. 504-515
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Fermat's method of factorisation
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- 13 March 2015, pp. 97-103
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The factorisation of 267 − 1
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- 13 March 2015, pp. 104-108
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Notes
99.27 A relationship between Pell numbers and triangular square numbers
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- 02 November 2015, p. 516
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99.13 Solving the quintic in radicals
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- 10 July 2015, pp. 319-323
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Where is the centre of a polygon?
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- 13 March 2015, pp. 109-120
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Notes
99.28 A generalisation of an intriguing ratio
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- 02 November 2015, pp. 516-522
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99.14 A recurrence relation for the limit point of nested triangles
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- 10 July 2015, pp. 323-325
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99.15 Triangles in which an = bn + cn
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- 10 July 2015, pp. 326-328
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99.01 Intercepts and turning points of polynomial functions
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- 13 March 2015, pp. 121-125
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99.29 On the sum of the reciprocals of the primorials
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- 02 November 2015, pp. 522-523
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99.16 Conditionally convergent series
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- 10 July 2015, pp. 328-331
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99.30 The positive eigenvector of a positive matrix
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- 02 November 2015, pp. 523-525
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99.02 Series involving fixed-column decimal representations
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- 13 March 2015, pp. 125-128
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99.03 Quick proofs that certain sums of fractions are not integers
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- 13 March 2015, pp. 128-130
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99.17 Irrational sums from reciprocals of factorials
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- 10 July 2015, pp. 331-335
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