Transactions of the American Mathematical Society · 1969 · 233 citations · 22 references
In this paper I show that the following four properties of a convex subset Z of Rn are equivalent:
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Linear Operators. Part I: General Theory.
Paul Civin, Nelson Dunford, J. T. Schwartz · American Mathematical Monthly · 1960 · 2.8K citations
Paul R. Halmos · Bulletin of the American Mathematical Society · 1948 · 147 citations · Full text