Levich equation

In mathematics, Schur's property, named after Issai Schur, is the property of normed spaces that is satisfied precisely if weak convergence of sequences entails convergence in norm.

Motivation

When we are working in a normed space X and we have a sequence $(x_{n})$ that converges weakly to $x$ (see weak convergence), then a natural question arises. Does the sequence converge in perhaps a more desirable manner? That is, does the sequence converge to $x$ in norm?

Definition

Suppose that we have a normed space (X, ||·||), $x$ an arbitrary member of X, and $(x_{n})$ an arbitrary sequence in the space. We say that X has Schur's property if $(x_{n})$ converging weakly to $x$ implies that $\lim _{n\to \infty }\Vert x_{n}-x\Vert =0$. In other words, the weak and strong topologies share the same convergent sequences. Note however that weak and strong topologies are always distinct in infinite-dimensional space.

Name

This property was named after the early 20th century mathematician Issai Schur who showed that ℓ¹ had the above property in his 1921 paper.

See also

• Radon-Riesz property for a similar property of normed spaces
• Schur's theorem

References

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