Angelo Lucia
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 Feb 18 awarded Popular Question Jan 12 awarded Critic Jan 6 comment Maximize $\text{trace}(Z^{T}A Z)/\text{trace}(Z^{T}B Z)$ Are they real or complex? What size do they have? What constrains do you have on the maximum? Your question still does not make sense to me. Jan 6 comment Maximize $\text{trace}(Z^{T}A Z)/\text{trace}(Z^{T}B Z)$ What are A,B,Z? What do you mean by $Z^\prime$? Over what set are you considering the maximum? You should clarify your question by explaining your notation. Dec 17 comment Show $\{ (\xi,\eta,\zeta) \in \mathbb{R^3} : \xi = \eta = \zeta \}$ is closed I never use triangle inequality: I am using the fact that $b_1 - a_1 \le |b_1 - a_1|$ and $b_2 - a_2 \ge - | b_2 - a_2|$. Shall I make it more clear in the answer? Dec 17 answered Show $\{ (\xi,\eta,\zeta) \in \mathbb{R^3} : \xi = \eta = \zeta \}$ is closed Dec 17 answered Continuity of evaluation maps in the topology of compact convergence on $C([0,\infty),\mathbb{R}^{n})$ Dec 16 comment Basis of a vector space is a maximal linearly-independent set? What is your definition of basis of a vector space? (There is a number of equivalent ways of defining a basis...) Dec 16 awarded Informed Dec 16 awarded Caucus Dec 13 awarded Yearling Dec 12 awarded Explainer Dec 12 revised A reflexive Banach space is separable iff its dual is separable typo in the title Dec 12 suggested approved edit on A reflexive Banach space is separable iff its dual is separable Dec 12 answered A reflexive Banach space is separable iff its dual is separable Dec 12 revised Convergence of a sequence in $l_2$ I said something wrong: weak convergence has nothing to do here Dec 12 revised Convergence of a sequence in $l_2$ added a reference to equivalence of weak and pointwise convergence Dec 12 revised Convergence of a sequence in $l_2$ the hint was wrong Dec 12 revised Convergence of a sequence in $l_2$ Added an hint Dec 12 answered Convergence of a sequence in $l_2$