ABSTRACT
According to [8,9], let us define by £ (resp.T) the real affine space, £ (resp. T ) its associated linear vector space such that £ (resp. £ ) is a hyperplane of T (resp. T ) and £ the projective completion of £. For our purpose, £ is a 3dimensional affine space and T is a 4-dimensional affine space. Let fi be a point of T not belonging to £. We call massic vector space the linear vector space £ = (£ x JR*) U £ .
