If $\Delta$ is a weak$^\ast$ continuous bounded linear operator on $\mathscr{B}(\mathscr{H})$ that fixes the ideal of compact operators $\mathscr{K}$ and $\Delta_0 ...
Proceedings of the American Mathematical Society, Vol. 33, No. 2 (Jun., 1972), pp. 316-318 (3 pages) Let $\Delta(G)$ be the intersection of the nonnormal maximal subgroup of a finite group. W.
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