michaeluskov
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 Dec15 awarded Caucus May20 awarded Tumbleweed May14 accepted Find norm of functional May13 comment Find norm of functional @UmbertoP. I think no, because if I know how to do it, you will be able to find the answer, so second question depends on first. May13 asked Find norm of functional May13 revised Extending a functional with same norm added 1 character in body May13 comment Extending a functional with same norm @MattN. oh, this is mistake. I edited post. May13 accepted Find norm of operator May13 comment Find norm of operator no, how to prove that $A$ is equal to scalar in $L_2$? May13 comment Find norm of operator But how to prove it? May13 comment Find a norm of operator form l1 to l1 So, supremum is 2, right? May13 comment Find norm of operator But why is $\int_0^2(t^2+2)x(t)dt$ scalar and equals to ? May13 accepted Find a norm of operator form l1 to l1 May13 comment Find a norm of operator form l1 to l1 Sorry, I didn't understand your further hint. So this function will be equal to 2 in $(1,0,0)$. And what does it mean? May13 comment Find norm of operator @RobertLewis Exactly. May13 asked Find norm of operator May13 comment Find a norm of operator form l1 to l1 @MhenniBenghorbal why? How to prove it? May13 awarded Commentator May13 comment Find a norm of operator form l1 to l1 But is there supremum of this function? I think no, WolframAlpha says no either, but how to prove it? May13 comment Extending a functional with same norm @Hamid Oh, thanks