MARTIN JOSEFSSON and MARIO DALCÍN – 150 characterizations of squares MARIUS DRĂGAN and OVIDIU T. POP – Some inequalities about the semiperimeter of excircle quadrilateral corresponding to a bicentric quadrilateral G. T. VICKERS – A note on quartic curves YU CHEN and R.J. FISHER – A natural family of parallel circles A. PERUCCA, N. SAGMAN, […]
LILIANA GHEORGHE and RONALDO GARCIA – Pascal and a triangular billiard MARTIN JOSEFSSON – Extensive compilation of characterizations of rectangles DIMITRIS M. CHRISTODOULOU and ATHANASIOS ZERVAS – Golden sections in contemporary music and in the Euclidean line segment PARIS PAMFILOS – On arbeli sharing their incircle BRADLEY C. DART – Inside – out: a study […]
MARIUS DRĂGAN and OVIDIU T. POP – Some inequalities involving the sums ∑sin A/2 and ∑cos A/2. RENATO MANFRIN – Pohlke projections in the hyperbolic case II MARIUS MUNTEANU and LAURA MUNTEANU – On the extrema of sums and products for points on the circumcircle of a triangle JOHN DONNELLY – The reflection line and […]
YU CHEN and R. J. FISHER – Symmedian locus configuration (II) MARIUS DRĂGAN and OVIDIU T. POP – The best majoration for some trigonometric sums in a triangle MILTON J. C. MENDEZ and ARMANDO M. V. CORRO – Generalized Ribaucour – type surfaces RENATO MANFRIN – Pohlke projections in the hyperbolic case JEAN J. RAKOTO and HANITRINIAINA […]
YU CHEN and R. J. FISHER – Symedian locus configuration (I) G. T. VICKERS – Pencils of lines and dual curves PARIS PAMFILOS – On van Lamoen’s theorem MARTIN JOSEFSSON and MARIO DALCÍN – Characterizations of quasi-isosceles quadrilaterals A. M. MAVAMBOU, O. M. MIKANOU and S. C. GATSÉ – Lightlike submersions of indefinite l.c.a cosymplectic […]
GATSE SERVAIS CYR – The reduction of Darboux’s theorem on Weil bundles MARTIN JOSEFSSON – Fifteen collinear points in bicentric quadrilaterals MARIUS DRĂGAN and OVIDIU T. POP – New inequalities in a bicentric quadrilateral ANTOINE MHANNA – Tango – quadrilaterals JIAN LIU – A new geometric inequality in acute triangles and its applications PARIS […]
OVIDIU T. POP and MARIUS DRĂGAN – About a general inequality and some application in the geometry of the quadrilateral MARTIN JOSEFSSON – Great compilation of characterizations of squares KENZI SATÔ – Centroids of hyperbolic simplices ATSUSHI FUJIOKA – Isothermally asymptotic centroaffine minimal surfaces of cohomogeneity one ZEYNEP CAN and ÖZCAN GELİŞGEN – Isometry groups […]
CHAI WAH WU – Minimal number of points on a grid forming line segments of equal length JOÃO A. M. GONDIM – Counting perpendicularly inscribed polygons that intersect a given side in an odd sided regular polygon MARTIN JOSEFSSON and MARIO DALCÍN – Beyond 100 characterizations of tangential quadrilaterals DANIELE RITELLI and ALDO SCIMONE and […]
MARTIN JOSEFSSON and MARIO DALCÍN – More new characterizations of extangential quadrilaterals ADRIAN BUD and OVIDIU T. POP – Theoretical considerations on an issue from Romanian National Mathematical Olympiad 2019 MAMUKA MESKHISHVILI – Two non-congruent regular polygons having vertices at the same distances from the point MARK SHATTUCK – A refinement of Tóth’s inequality NORIHIRO […]