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View:  Topic list, Topic summary Topics 1 - 10 of 14747  Older »
Description: Discussion of current mathematical research. (Moderated)
 

a problem in star formation 
  This is a little idle reasoning. it is coherent. but the data may be false. so please help me. all the calculations are doable with a TI30S calculator. I put 'B' into A and 'C' into B and 'c' into C and 'M' into D... more »
By josephus  - May 21 - 1 new of 1 message    

Call for Papers: World Congress on Engineering and Computer Science WCECS 2013 
  Call for Papers: World Congress on Engineering and Computer Science WCECS 2013 CFP: World Congress on Engineering and Computer Science WCECS 2013 Draft Paper Submission Deadline: 2 July, 2013 Camera-Ready Papers Due & Registration Deadline: 30 July, 2013 WCECS 2013: San Francisco, USA, 23-25 October, 2013... more »
By iaeng_imecs_wce_wcecs_a  - May 21 - 1 new of 1 message    

Obtaining the circumsphere of a simplex from the Cayley Menger matrix 
  It is well known how to obtain the circumsphere of a simplex, given the coordinates of the vertices. But there is a rather nice expression that uses only the squared distances. One can read of the radius and barycentric coordinates directly from the Cayley-Menger matrix. In 3D, if the inverse Cayley-Menger matrix is:... more »
By Gerard Westendorp  - May 20 - 1 new of 1 message    

Thirteen papers published by Geometry & Topology Publications 
  Ten papers have been published by Algebraic & Geometric Topology (1) Algebraic & Geometric Topology 13 (2013) 1513-1530 Centralizers of finite subgroups of the mapping class group by Hao Liang URL: [link] DOI: 10.2140/agt.2013.13.1513... more »
By Geometry and Topology  - May 19 - 1 new of 1 message    

Eleven papers published by Geometry & Topology Publications 
  Seven papers have been published by Algebraic & Geometric Topology opening Issue 3 of Volume 13 (1) Algebraic & Geometric Topology 13 (2013) 1243-1271 Context-free manifold calculus and the Fulton-MacPherson operad by Victor Turchin URL: [link]... more »
By Geometry and Topology  - May 2 - 2 new of 2 messages    

Asymptotics of one function on natural numbers 
  Below, N is the set of natural numbers. Consider a function s: N->N such that s(x) = x + 1. Now, if f: N->N is an arbitrary function, define a mapping from the set of all such functions to N as given below: p(f) = c(1) where c is the composition of functions s and f. Finally, define a new function g: N->N such that... more »
By dmitri. vorobiev @ gmail. com  - May 2 - 2 new of 2 messages    

convex function through finite points with minimal area 
  Markus wrote, On 4/16/2013 1:06 PM: ... What about the convex hull of the (x_i, y_i) and (0,0)? Perhaps I don't understand what you really want. [ Moderator Note: I believe Markus wants the least area below the graph, but the convex hull will have the greatest area. ]
By Jeff Barnett  - Apr 17 - 1 new of 1 message    

convex function through finite points with minimal area 
  Hello everyone, last week I found a question during my seminar work and couldn't solve it. I'm wondering if anybody else wants to work on this since the question is pretty easy but a solution turns out to be (at least) not as easy as the question. So, Given function values y_i for finite x_i's in the interval (0,1) such... more »
By Markus  - Apr 16 - 2 new of 2 messages    

a problem with temperature records 
  I have some data sets ENGLAND 1729-1970, NOAA 1880-2012 GISS == NOAA data. I even have a data set for ICE but that is not my problem. the problem is when I run a least squares algorithm over the data set. should I change the extent, the slope increases (??).... more »
By josephus  - Apr 13 - 8 new of 8 messages    

Computer Applications Conference Hong Kong (IEEE Xplore/Ei Compendex/ISTP) 
  Topics of the Computer Applications Track include, but are not limited to, Communications and Networking, Automation and Control, Data Engineering, Signal Processing and Multimedia. The Computer Applications Track will be a part of the 2013 4th World Congress on Software Engineering (WCSE 2013, [link] ), 3-4... more »
By Prof Zhou  - Apr 12 - 1 new of 1 message    

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