TY - JOUR AU - G. Kazandzidis TI - The law of inertia (Traegheitsgesetz) for quadratic forms and a necessary and sufficient condition for a linear form to belong to the space spanned by a given system of linear forms JO - Δελτίο της Ελληνικής Μαθηματικής Εταιρίας PY - 1966 SP - 156 EP - 160 VL - 07Α PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DEME_1966__07%CE%91_a12/ LA - gr ID - DEME_1966__07Α_a12 ER -