This monthly journal, published since 1900, is devoted entirely to research in pure and applied mathematics, and, in general, includes longer papers than those in the Proceedings of the American ...

Transactions of the American Mathematical Society, Vol. 263, No. 2 (Feb., 1981), pp. 493-500 (8 pages) Let $\Delta'$ be the class of all derivatives. The main goal of this paper is the investigation ...

Waddington’s famous drawing of the epigenetic landscape has been used for more than 60 years to visually describe the differentiation of cells. Now, a group has sought to move beyond a qualitative ...