This paper contains a number
of minimax theorems in various topological and non-topological situations. Probably
the most interesting is the following: if X is a nonempty bounded convex subset of a
real Hausdorff locally convex space E with dual E′ and each φ ∈ E′ attains its
supremum on X then
It is also proved that if (∗) is true and X is complete then X is w(E,E′)-compact.
Combining these results, a proof of a well known result of R. C. James is
obtained.
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