 It is interesting to note that the overall structure and contents of sections in PM and Basic Laws are similar. They both share a first section on the symbolic logic that they will use, then a series of definitions and theorems about the notions of number and concepts used in arithmetic, with a concluding section on real numbers. While the range of the mathematics that is to be reduced to logic in the two works is the same, Frege restricts his work more directly to natural and real numbers, while PM includes the theory of classes and arithmetic of relations and relations and infinite sets. While all of these topics are handled in the initial chapters of a contemporary textbook in axiomatic set theory, as Urquhart (2013) suggests, this may be the inevitable fate of even the most groundbreaking mathematical works.