The Tohoku Mathematical Journal is published quarterly by the Mathematical Institute of Tohoku University. Founded by T. Hayashi, the journal was started in August 1911 as the first mathematical journal in Japan. From its inception, the journal was a truly international research publication, accepting qualified original articles on pure and applied mathematics.

Volume 24, Number 4

Publication Date: 1972

Miscellaneous front pages, Tohoku Math. J., Volume 24, Number 4 (1972)

Approximation of operator semigroups in a Banach space

T. Takahashi and S. Ôharu; 505-528

Left invertibility of closed operators modulo an $\alpha$-compact operator

John Ernest; 529-537

Convergence in perturbed nonlinear systems

Athanassios G. Kartsatos; 539-546

Double commutants of isometries

T. Rolf Turner; 547-549

On summation processes of Fourier expansions in Banach spaces, II. Saturation theorems

P. L. Butzer, R. J. Nessel and W. Trebels; 551-569

Minimal submanifolds and convex functions

Kiyotaka Ii; 571-579

On maximal families of compact complex submanifolds of complex manifolds

Makoto Namba; 581-609

Miscellaneous back pages, Tohoku Math. J., Volume 24, Number 4 (1972)