TY - JOUR AU - D. M. Bătineţu-Giurgiu AU - Neculai Stanciu TI - Proofs for old and new triangle inequalities JO - The Teaching of Mathematics PY - 2020 SP - 30 VL - XXIII IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TM2_2020_XXIII_1_a3/ LA - en ID - TM2_2020_XXIII_1_a3 ER -