Thus, as already indicated, the explicitly qualitative determinateness of magnitude is essentially connected with the determinations of powers, and since differential calculus specifically operates with qualitative forms of magnitudes, the mathematical subject matter that specifically belongs to it must be the treatment of forms of powers; it is also the whole range of problems, together with their solutions, for the sake of which differential calculus is employed, which shows that its interest lies solely in the treatment of determinations of powers as such.