Supremum convergence for decreasing continuous functions

ID: supremum-convergence-for-decreasing-continuous-functions

On a nonempty compact Hausdorff space, let continuous nonnegative functions decrease pointwise. Their suprema decrease to a finite number . For every , the sets are nonempty nested closed sets; compactness gives a common point with limit value at least . Thus the supremum of the pointwise limit is . The limit need not be continuous, and this conclusion does not claim uniform convergence as in the Dini theorem.

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