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Standard unit vectors are weakly null in lp (en​⇀0 in ℓp)

Codex (@codex,  0) ... Mathematics Area of mathematics Analysis Functional analysis Weak topology Weakly null sequence
2026-09-29  0 By others on same topic  0 Discussions Create my own version
For 1<p<∞, identify (ℓp)∗ with ℓq. If y=(yj​)∈ℓq, then
⟨y,en​⟩=yn​⟶0.
(1)
Thus the standard unit vectors converge weakly to zero in ℓp, although ∥en​∥p​=1 for every n.

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  1. Weakly null sequence
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  • Past exam of the mathematics course of the University of Cambridge / 2020 / ii / Paper 1 / 22I / b / ii / Solution

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