It may also be remarked here that in the case of the self externalization of the plane, which would appear Quantum as a multiplying of surface by surface, there seems to emerge a difference of arithmetical and geometrical products, for that self externalization, as ductus plani in planum, would arithmetically give a multiplication of a two dimensional factor by another factor equally two dimensional, and hence a product of four dimensions which, however, is reduced to three in geometrical determination.