Prove that the subspace (c_0 in a Banach space) of all sequences of real numbers that
converge to zero is not complemented
具体可参考
R.S.Philips On linear transformations, Trans. Amer, Math. Soc 48 (1940) 516-541
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: 什么是Phillip's Lemma？大概内容是啥？
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