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author | Justin Gassner <justin.gassner@mailbox.org> | 2024-02-15 05:11:07 +0100 |
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committer | Justin Gassner <justin.gassner@mailbox.org> | 2024-02-15 05:11:07 +0100 |
commit | 7c66b227a494748e2a546fb85317accd00aebe53 (patch) | |
tree | 9c649667d2d024b90b32d36ca327ac4b2e7caeb2 /pages/functional-analysis-basics/the-fundamental-four/uniform-boundedness-theorem.md | |
parent | 28407333ffceca9b99fae721c30e8ae146a863da (diff) | |
download | site-7c66b227a494748e2a546fb85317accd00aebe53.tar.zst |
Update
Diffstat (limited to 'pages/functional-analysis-basics/the-fundamental-four/uniform-boundedness-theorem.md')
-rw-r--r-- | pages/functional-analysis-basics/the-fundamental-four/uniform-boundedness-theorem.md | 6 |
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diff --git a/pages/functional-analysis-basics/the-fundamental-four/uniform-boundedness-theorem.md b/pages/functional-analysis-basics/the-fundamental-four/uniform-boundedness-theorem.md index 47ddd3f..1140e45 100644 --- a/pages/functional-analysis-basics/the-fundamental-four/uniform-boundedness-theorem.md +++ b/pages/functional-analysis-basics/the-fundamental-four/uniform-boundedness-theorem.md @@ -14,11 +14,13 @@ Let $X$, $Y$ be normed spaces. We say that a collection $\mathcal{T}$ of bounded linear operators from $X$ to $Y$ is {: .mb-0 } -- *pointwise bounded* if the set $\braces{\norm{Tx} : T \in \mathcal{T}}$ is bounded for every $x \in X$, +- *pointwise bounded* if the set $\braces{\norm{Tx} : T \in \mathcal{T}}$ is bounded + for every $x \in X$, - *uniformly bounded* if the set $\braces{\norm{T} : T \in \mathcal{T}}$ is bounded. {% enddefinition %} -Clearly, every uniformly bounded collection of operators is pointwise bounded since $\norm{Tx} \le \norm{T} \norm{x}$. +Clearly, every uniformly bounded collection of operators is pointwise bounded +since $\norm{Tx} \le \norm{T} \norm{x}$. The converse is true, if $X$ is complete: {% theorem * Uniform Boundedness Theorem %} |