%0 Journal Article %A G. Kazandzidis %T 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 %J Δελτίο της Ελληνικής Μαθηματικής Εταιρίας %D 1966 %P 156-160 %V 07Α %I mathdoc %U http://geodesic.mathdoc.fr/item/DEME_1966__07%CE%91_a12/ %G gr %F DEME_1966__07Α_a12