Does any closed subset in a Banach space have (at least one) point that has a minimum norm?
I think this statement is obviously true, but how do I prove its correctness?
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Does any closed subset in a Banach space have (at least one) point that has a minimum norm? I think this statement is obviously true, but how do I prove its correctness? |
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The previous version of my answer was wrong. The following example was suggested by commenter(see the comments). |
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