If the only difficulty affecting mathematics came from the concept in general, then mathematics could brush it aside without more ado since the concept is more than just the statement of the essential determinacies of a fact, that is, of its determinations according to the understanding, and, so far as precision in such definitions goes, mathematics leaves nothing to be desired: it is not a science that concerns itself with the concepts of its subject matter and which would have to generate their content by developing the concept, even if only by means of ratiocination.