M-Theory and String-String Duality

Abstract

In this article we examine the compatibility of some recent results, results relating M-Theory to String Theory, with the string-string duality conjecture in six-dimensions. In particular, we rederive the relation between M-Theory and Type IIA strings. We then go on to examine in detail M-Theory on $K3\times S^1$ and its relation to the Heterotic theory on $T^4$. We conclude with some remarks on M-Theory on $T^4\times (S^1/{\mathbf{Z}}_2)$ and its relation to the Type II theory on $K3$.

28 Pages, Uses harvmac.tex