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Apr 30 
comment 
Is there a Legendrian Neighbourhood Theorem also for noncooriented contact manifolds?
Dear Daniele Sepe, first of all, thank for your attention to my question, and sorry for the delay in my comment; initially, some activities forced me to reduce my presence on the site, then, I forgot of you answer. Now, I do not know if, in the meanwhile, you went somewhere with the modified question. But I have found a 1998 paper by F. Loose which gives a positive answer exactly to that question after having chosen the graph of the $1$jet of the zero section of $p:L_N\to N$ as the normal form of contact manifolds on a neighborhood of a legendrian submanifold $N$. 
Jan 9 
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Hilbert's syzygy theorem in the analytic setting
Dear Eric, I added a true link towards your question on Math.SE, I hope you do not mind. 
Nov 18 
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Is there a Legendrian Neighbourhood Theorem also for noncooriented contact manifolds?
Dear @G_infinity, so, on a neighbourhood of $\mathbb P_x(T^\ast M)$ in $\mathbb P(T^\ast M)$, there doesn't exist any contact form $\alpha$, otherwise it would determine a global section of the line bundle. Thank you very much. 
Nov 17 
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Is there a Legendrian Neighbourhood Theorem also for noncooriented contact manifolds?
Dear @Petya, could you give more details about the noncoorientability of the contact structure of $\mathbb P(T^\ast M)$ in any neighbourhood of the fibers of $\mathbb P(T^\ast M)\to M$? You could also consider to post your comment as an answer. 
Nov 4 
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Can you find linear recurrence relation for dimensions of invariant tensors?
Trying to improve a suggested edit of @dimension10 I corrected the three hyperlinks. 
Nov 2 
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Relation between graphs and groupoid $C^*$algebras
Dear Nicola Ciccoli, hoping to be helpful, I added a link to the quoted paper, with just some other minor edits. 
Oct 31 
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barcobar or cobarbar
@Sean Tilson I have added a referencerequest tag 
Oct 2 
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The universal property of the Liouville $1$form
Dear @MichaelBächtold where have you heard about this notion relative one forms? 
Oct 2 
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The universal property of the Liouville $1$form
@MartinBrandenburg, given a smooth map $X\to Y$, I know how to construct its cotangent lift $T^\ast Y\to T^\ast X$, only when $X\to Y$ is a local diffeomorphism, but not in general. So we can work at least with the subcategory of local diffeomorphisms $X\to Y$. 
Mar 10 
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On the set of zero radial limits of bounded analytic functions
From "How to write math" (look on the right $\rightarrow$): if you're having problems with the preview (or the post looks wrong), put backticks around any math that contains underscores or asterisks. E.g. write $f'_n=g_{n+1}$ .

Jan 28 
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Explicit Casselman theory: reference needed
Dear Andrea Mori, I have tried to get displayed the matrices, without modify their content. 
Jan 22 
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Elements of the history of mathematics
Here is: mathoverflow.net/questions/91385/… 
Jan 22 
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Elements of the history of mathematics
Dear Chandan Singh Dalawat, last year Roger Godement answered a question here on MathOverflow, surely he could give invaluable information. 
Jan 22 
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Elements of the history of mathematics
Dear Delio Mugnolo, I don't have an answer, but I would just remark that Bourbaki's "Elements of Hystory of Mathematics" recollects the historical sections disseminated in the volumes of the "Elements of Mathematics". By the way, Jean Dieudonné wrote historical works on his own, and directed the work of a group of mathematician to write "Abrégé d'histoire des mathématiques 17001900". 
Jan 19 
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Tangent space of the moduli stack of Drinfeld modules
Dear Peter Arndt, I have tried to edit your question without altering its content. Is it ok for you? 
Jan 7 
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Schauder estimates for higher order linear elliptic operator on manifold
When MathJax seems having problems, the basic solution is to enclose between backtips any TeX code containing underscores or asterisks. 
Jan 7 
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Schauder estimates for higher order linear elliptic operator on manifold
Dear Italo I have tried to edit your question, it is ok for you? 
Jan 7 
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Old books still used
The first Russian edition is dated 1953. 
Jan 7 
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Old books still used
@Qfwfq @Joe Silverman the first edition of Lang's Algebra appeared in 1965. 
Jan 7 
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Old books still used
The four volumes were published between 1887 and 1896. 