Answer to Question #12465 in Linear Algebra for john.george.milnor
Let we have two convergent series Series(|a_n|^2) and
They can be regarded as norm of two elements of infinite
dimensional normed space R^(inf).
Thus as norm has property
||a+b||<=||a||+||b|| then Series(|a_n+b_n|^2) is convergent too,
sequences with property Series(|a_n|^2)<(inf) are subspace in
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