368 reputation
111
bio website poisson.phc.unipi.it/~lucia
location Madrid, Spain
age 27
visits member for 3 years, 5 months
seen Jan 21 at 14:58

Math PhD student at Universidad Complutense de Madrid, working on Quantum Information and Quantum Dissipative Systems.


Jan
12
awarded  Critic
Jan
6
comment A positive divergent sequence $\{a_n\}$ diverges at the same rate as $\sup_{k\geq n} a_k$?
If $a_n$ is positive and divergent, then $sup_{k \ge n} a_k$ is constantly equal to $\infty$, and your question does not make much sense. Am I still missing your point?
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
revised Prove $\mathbb{R}^k$ is complete w.r.t. the maximum norm
corrected LaTeX and changed the title, since the specific norm has a name
Dec
17
suggested approved edit on Prove $\mathbb{R}^k$ is complete w.r.t. the maximum norm
Dec
17
comment Prove $\mathbb{R}^k$ is complete w.r.t. the maximum norm
Try to write down the condition for a convergent/Cauchy sequence w.r.t. the $\Vert \cdot \Vert_\infty$ norm, and see if you can apply your knowledge on completeness of $\mathbb R$...
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