6,322 reputation
32772
bio website saveitep.org
location Moscow
age 40
visits member for 4 years, 1 month
seen 3 hours ago
http://ru.linkedin.com/pub/alexander-chervov/57/447/a93
Started as A.A. Kirillov's student in rerpresentation theory in Moscow State University. Got PhD in 1999. Worked in ITEP Moscow for 10 years somewhere in between representation theory, integrable systems and algebraic geometry, in particular geometric Lanlgands and its connection to Hitchin-Gaudin integrable systems.
Currently in industry: quantitative finance, previously in wireless telecommunication doing applied math.: information theory, error-correcting codes, statistical estimation theory, numerical algorithms.
Deeply worried about the ITEP very unfortunate situation: http://saveitep.org
http://n-vetlitskaya.livejournal.com/241846.html
Leading Russian research center is in danger. More than 850 scientists signed letter to president and prime-minister asking for help. Fields medalists M. Atiyah, L. Lafforgue, E. Witten, Nobel Prize winner D. Gross, mathematicians A. Beilinson, I. Cherednik, B. Dubrovin, P. Etingof, B. Feigin, A. Kirillov, I. Krichever, N. Reshetikhin, E. Vinberg, physicists J. Cardy (Oxford), M. Douglas, J. Froehlich, J. Maldacen (IAS), N. Nekrasov(IHES, ITEP), B. de Wit, are among them.
You can join support letter here: https://sites.google.com/site/itep2012/english

Nature, 27.01.2012 , Geoff Brumfiel 'Russian physicists protest government consolidation' http://www.nature.com/news/russian-physicists-protest-government-consolidation-1.9921

I worked in ITEP more than 10 years, I learned a lot from these people and it is really one the best institutes in Russia and world. Like many colleagues I am really afraid that current situation is step by step programm of killing ITEP. Last year newly instead director made from research institute "GULAG-light" as said Prof. Stan Brodsky from Stanford said after seeing all this.
My name Alexander Chervov
al. mysurname at gmail dot com

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Oct
27
comment Can (how) one distinguish germs of continuous functions by a countable set of params?
Function on germs: IF germ has derivative, then F(germ)=derivative, ELSE zero. This function seems to me quite "nice" and "constructive". Seems we do not need AC to define it. In contrast to your another example - "reals/rational translation" - it seems to me for that example there is NO "nice" function at all, is it correct ? So may be these two examples are different ? Pay attention that germs correspond to tail of sequences which have limit - may be property of having limit change something...
Oct
27
comment Can (how) one distinguish germs of continuous functions by a countable set of params?
Remark. It seems to me fractal dimension is "nice" function on germs. But it seems you say that there are NO "nice" functions on germs (AC is necessary).... Some contradiction in my head
Oct
27
comment Can (how) one distinguish germs of continuous functions by a countable set of params?
Germs = function/equivalence relation. It seems to me we can choose representative by definition - choose an a element in subset of equivalent functions. What is wrong ? And yes, it gives answer to my question, of course, it is not the anwer I hoped to, but formally it is an answer. I'll think how to modify my question to avoid this answer, but let me do it later...
Oct
25
comment Can (how) one distinguish germs of continuous functions by a countable set of params?
Why do we need to choose representative ?
Oct
25
comment Can (how) one distinguish germs of continuous functions by a countable set of params?
It seems you are saying that germs are isomorphic as a ring to tails of sequences with additional requirement that sequences should have a limit. Indeed, take x_n->0 and map a function to its values f(x_n), passing to germs corresponds to tails. Correct ? What is the role of AC ?
Oct
22
comment Can (how) one distinguish germs of continuous functions by a countable set of params?
Thank you ! First sentence : analytic - you mean continuous?
Oct
20
comment “Nice” functions on infinite-dimensional space of germs of continuous functions at a point
@IgorKhavkine Okay, you are right with you examples. Can I beg for more examples ? )) Is there any way to produce lots of them not in some artificial way ? (Like choose some predescribed germs or subsets of germs and send them to predescribed reals (that is generalization of your smooth->1) ?
Oct
20
comment “Nice” functions on infinite-dimensional space of germs of continuous functions at a point
@IgorKhavkine would you mind looking at mathoverflow.net/questions/184897/…
Oct
20
comment “Nice” functions on infinite-dimensional space of germs of continuous functions at a point
Would you mind looking at: mathoverflow.net/questions/184897/…
Oct
20
comment “Nice” functions on infinite-dimensional space of germs of continuous functions at a point
Is it correct that your "functional" sends germ f(x) to natural number "k" ?
Oct
20
comment “Nice” functions on infinite-dimensional space of germs of continuous functions at a point
Dear Prof. Michor thank you for your kind answer. Let me try to check my understanding. Informal idea: we can make a function which quantifies how fast is germ f(x) growing nearby. To do it you suggest to compare it with some other functions which grows very fast. So you suggest exp(exp(exp(exp(....)). Is this understanding correct ?
Oct
20
asked Can (how) one distinguish germs of continuous functions by a countable set of params?
Oct
19
comment “Nice” functions on infinite-dimensional space of germs of continuous functions at a point
@igorkhavkine lets forget about "coordinates". Just what are examples? What are other examples of "quantative properties" ? Can you suggest one more?
Oct
19
comment “Nice” functions on infinite-dimensional space of germs of continuous functions at a point
@igorkhavkine what about fractal dimension? It is bounded by 2 , so upper limit for it --- need not to be tracated by hands