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Issue 1
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Front matter
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Table of Contents
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Article: Integers expressible as sums of primes and composites
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1
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Article: Bridges between three remarkable inequalities
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8
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Article: Ein chinesisches Orakel und zyklische Matrizen über dem Körper F2
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15
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Article: Three collinear triangle centres
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25
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Article: A ring-theoretic approach to the double-sidedness of the matrix inverse
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30
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Article: A geometric property of the Möbius transformation
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34
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Rubric: Aufgaben
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38
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Back matter
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Issue 2
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Front matter
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Table of Contents
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Article: Regular spatial heptagons based on symmetry
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45
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Article: An interesting theorem on circumscribed hexagon
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57
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Article: On quasi-Heronian equable triangles
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65
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Article: The circle as generator of Pythagorean triangles
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71
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Article: Generalizing Lehmer's totient problem
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77
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Article: The generalized Binet formula for k-bonacci numbers
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80
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Rubric: Aufgaben
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84
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Back matter
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Issue 3
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Front matter
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Table of Contents
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Article: On squares circumscribing quadrangles
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89
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Article: Geometrie der Zahlen
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98
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Article: Equicevian points in a triangle
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109
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Article: A note on rings in which each element is a sum of two idempotents
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126
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Article: Vandermonde's identity proved by complex analysis
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128
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Rubric: Aufgaben
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131
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Back matter
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Issue 4
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Front matter
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Table of Contents
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Article: A combinatorial approach for computing the determinants of the generalized Vandermonde matrices
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137
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Article: Similarity of quadrilaterals as starting point for a geometric journey to orthocentric systems and conics
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148
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Article: Construction of a quadrilateral from its vertex angles and the diagonal angle
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159
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Article: A new refinement of the Garfunkel-Bankoff inequality
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167
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Article: An improvement of the Weitzenböck inequality
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171
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Article: A generalization of Boole's formula derived from a system of linear equations
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173
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Rubric: Aufgaben
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176
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Back matter
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