TY - JOUR AU - Szabó, György TI - Pythagorean orthogonality and additive mappings. JO - Aequationes mathematicae PY - 1997 VL - 53 IS - 1-2 SP - 108 EP - 126 KW - James orthogonality; unconditional additivity; normed vector space; isosceles orthogonality; Pythagorean orthogonality; Abelian group; orthogonally additive mappings; geometry of normed spaces UR - http://eudml.org/doc/137680 ER -