JournalsemVol. 70, No. 2Volume 70, No. 2 (2015) Elemente der Mathematikpp. 45–48A characterization by optimization of the orthocenter of a triangleJean-Baptiste Hiriart-UrrutyPierre-Jean Laurentpp. 49–54A new Faà di Bruno type formulaUlrich Abelpp. 55–66A probabilistic approach to some binomial identitiesChristophe VignatVictor H. Mollpp. 67–70Buffon’s problem with a pivot needleUwe Bäselpp. 71–78On the theorem of the three perpendicularsJin-ichi ItohJoël RouyerCostin Vîlcupp. 79–81On an inequality in lp(C) involving Basel problemZarif O. IbragimovDiyora F. Salimovapp. 82–85Aufgabenpp. 86–88Rezensionen
pp. 45–48A characterization by optimization of the orthocenter of a triangleJean-Baptiste Hiriart-UrrutyPierre-Jean Laurent