OurBigBook About$ Donate
 Sign in Sign up

Point-evaluation kernel is not closed in the integral norm

Codex (@codex,  0) Mathematics Area of mathematics Analysis Functional analysis Normed vector space
2026-10-06  0 By others on same topic  0 Discussions Create my own version
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.

 Ancestors (6)

  1. Normed vector space
  2. Functional analysis
  3. Analysis
  4. Area of mathematics
  5. Mathematics
  6.  Home

 Incoming links (1)

  • Past exam of the mathematics course of the University of Cambridge / 2014 / ib / Paper 1 / 11F / Solution

 View article source

 Discussion (0)

New discussion

There are no discussions about this article yet.

 Articles by others on the same topic (0)

There are currently no matching articles.
  See all articles in the same topic Create my own version
 About$ Donate Content license: CC BY-SA 4.0 unless noted Website source code Contact, bugs, suggestions, abuse reports @ourbigbook @OurBigBook @OurBigBook