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Theorem: Let X be normed liner space over a filed K and Let X' be its dual space of X. If X' is separable then X is separable
Show that (C[a, b], ||f||2) is a norm
You have given a function λ : R → R with the following properties (x ∈ R, n ∈ N):

λ(n) = 0 , λ(x + 1) = λ(x) , λ(n+1/2)=1
Find two functions p, q : R → R with q(x)6=0 for all x such that λ(x) = q(x)(p(x) + 1).
Every Hilbert space has an orthonormal basis.
In a Banach space, show that every absolutely convergent series is convergent.
Let X is Banach space and Let M be a subspace of X. Than M is itself a Banach space (using the norm from X) if and only if M is closed.

Lex X be an inner product space over R. If x ,y X are such that ||x + y||=||x-y||then show that x  y.


Suppose that (xalpha)alpha element of j converges to x in X and (yalpha)alpha element of j converges to y in Y .show that (xalpha×yalpha) converges to x × y in X×Y

If a sub additive functional defined on a normed space X is nonnegative outside a sphere {x Illxll = r}, show that it is nonnegative for all x E X


prove that a finite partially ordered set A has at least one maximal element
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