Let P be a projection of a normed lined

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Chapter2: Second-order Linear Odes
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Theorem 2.40. Let P be a projection of a normed linear space X into
itself. Then P is a closed map if and only if its range and null space are closed in X.
The projection P is continuous also, if X is a Banach space.
Transcribed Image Text:Theorem 2.40. Let P be a projection of a normed linear space X into itself. Then P is a closed map if and only if its range and null space are closed in X. The projection P is continuous also, if X is a Banach space.
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