Point-evaluation kernel is not closed in the integral norm
ID: point-evaluation-kernel-is-not-closed-in-the-integral-norm
On continuous functions on a compact interval, evaluation at an interior point is not continuous in the integral norm. Narrow triangular peaks have fixed point value and integral tending to zero. Subtracting such a peak from the constant function one gives functions vanishing at the point and converging in the integral norm to one. Thus the evaluation kernel is not closed, although it is closed in the uniform norm.
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