Sergei Akbarov
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 2d comment The spectrum and the tangent space of the algebra of holomorphic functions on a Stein manifold Actually, I don't understand... For which Stein manifold $N$ we have ${\mathcal O}(N)={\mathbb C}[\varepsilon]/\varepsilon^2$? 2d comment The spectrum and the tangent space of the algebra of holomorphic functions on a Stein manifold @nfdc23, is it possible that this is simpler? Let $I_s$ be the ideal of functions in ${\mathcal O}(M)$ vanishing at the point $s\in M$. Actually, I need the following: if a system of functions $f_1,...,f_n\in {\mathcal O}(M)$ form local coordinates in a point $s\in M$ and $f_1(s)=...=f_n(s)=0$, then for any $f\in {\mathcal O}(M)$ the function $f-f(s)-\lambda_1 f_1-...-\lambda_n f_n$ belongs to $(I_s)^2$, where $\lambda_i$ are the partial derivatives of $f$ in the point $s$ along the coordinates $f_i$. Is this true? May 1 comment The spectrum and the tangent space of the algebra of holomorphic functions on a Stein manifold OK, thank you!! May 1 comment The spectrum and the tangent space of the algebra of holomorphic functions on a Stein manifold Ben, I can't get this paper. Does Rossi prove the homeomorphism of topological spaces or just the equality of sets? May 1 comment The spectrum and the tangent space of the algebra of holomorphic functions on a Stein manifold Ah, OK! And what about the tangent space? Apr 29 comment Why do we study symplectic geometry? Questions about applications are very important, and, by the way, they inspire research. It is not good to close them. Apr 24 comment Attempted Banachification of a space Will, I am a bit far from this now, this is just my feeling. Can you reformulate your definition in categorical terms (i.e. using linear continuous maps as arrows)? Apr 24 comment Attempted Banachification of a space This reminds of the bornologification: books.google.ru/…, or arxiv.org/abs/1110.2013, page 44, example 1.13. I believe, the differences, if any, are not essential. Apr 7 comment Applications of functional analysis beyond analysis(towards algebra, geometry, number theory…) @Yemon, independently on how we define the borders, the questions about applications - "why are you doing (/interested in) this?" - are inevitable. Is there a possibility to ask this at MO (or anywhere else)? And do you agree that people who ask this have right to do this? Apr 6 comment Applications of functional analysis beyond analysis(towards algebra, geometry, number theory…) @Yemon, in my opinion your doubts about Beurling and the rest are not very serious. There must be more clear rules for decisions like this. Apr 6 comment Applications of functional analysis beyond analysis(towards algebra, geometry, number theory…) @IanMorris, I understand you, but there is a difference between some random titles of the articles in GAFA and a possibility to speak with people who have their own opinion on this question. Apr 6 comment Applications of functional analysis beyond analysis(towards algebra, geometry, number theory…) @IanMorris, some people don't have access to mathscinet. Apr 5 comment Which complete Boolean algebras arise as the algebras of projections of commutative von Neumann algebras? Yes, I meant this. OK. Apr 5 comment Which complete Boolean algebras arise as the algebras of projections of commutative von Neumann algebras? @DmitriPavlov, are there any generalizations of these constructions to non-commutative case? Mar 28 comment A linear functional on $C(K)^*$ continuous on each $L_1(\mu)$ Of course! Actually, I think there must be a reminder for people like me, who don't know things like this. Say, a button "cross post" with an explanation when it should be used. Mar 28 comment A linear functional on $C(K)^*$ continuous on each $L_1(\mu)$ Nate, excuse me, I did not know about this rule. I already apologized to David Ullrich. Mar 25 comment Sequentiality of largest vector topology Ah, OK, I am sorry. Mar 24 comment Sequentiality of largest vector topology It seems to me I saw something similar here: link.springer.com/article/10.1007%2FBF01234921 Perhaps, this will help. Mar 23 comment Sequentiality of largest vector topology What do you mean by "vector topology"? Mar 6 comment Is the Mendeleev table explained in quantum mechanics? Anyway, the words "Postulates of quantum mechanics", en.wikipedia.org/wiki/…, must mean something. If they are not the same as postulates (or axioms) in Mathematics, then there must be an explanation of their meaning. Otherwise this becomes an abuse of the trust of a listener, isn't it?