Genevieve Walsh, Tufts University Abstract: A group is coherent if every finitely generated subgroup is finitely presented, and incoherent otherwise. Many well-known groups are coherent: free groups, surface groups, and the fundamental groups of compact 3-manifolds. We consider groups of the form $F_m \by F_n$ or $S_g \by…

Dr. Alexander Goncharov, Department of Mathematics, Yale University Abstract: The logarithm is unique, up to a multiplicative constant,  continuous function satisfying the addition law:ln (xy)= ln x + ln y. It is also the integral of dt/t from 1 to x. The quest for understanding of integrals was and is one of the…