The Michigan Mathematical Journal is published by the Department of Mathematics at The University of Michigan and endeavors to publish significant research articles in all areas of mathematics.

### Volume 15, Issue 2

#### Publication Date: June 1968

Miscellaneous front pages, Michigan Math. J., volume 15, issue 2 (June 1968)

On the order of a simply connected domain.

Donald Sarason; 129-133

A proof of a statement of Banach about the weak${}^{\ast}$ topology.

O. Carruth McGehee; 135-140

Minimum convexity of a holomorphic function.

J. E. McMillan; 141-144

On the symplectic bordism groups of the spaces ${\rm Sp}(n)$, ${\rm HP}(n)$, and ${\rm BSp}(n)$.

Peter S. Landweber; 145-153

Pairs of matrices generating discrete free groups and free products.

Morris Newman; 155-160

Pairs of real $2$-by-$2$ matrices that generate free products.

R. C. Lyndon and J. L. Ullman; 161-166

Structure theorems for regular local Noether lattices.

Kenneth P. Bogart; 167-176

Nonlinear differential equations in Banach spaces, and applications.

C. T. Taam; 177-186

Some $n$-dimensional manifolds that have the same fundamental group.

R. H. Fox; 187-189

Wild points of cellular subsets of spheres in $S^3$. II.

L. D. Loveland; 191-192

A category slightly larger than the metric and ${\rm CW}$-categories.

D. M. Hyman; 193-214

Irreducible operators.

P. R. Halmos; 215-223

Smoothness of approximation.

Richard Holmes and Bernard Kripke; 225-248

Specified relations in the ideal group.

Luther Claborn; 249-255

Miscellaneous back pages, Michigan Math. J., volume 15, issue 2 (June 1968)

256-258