Description:
Mathematical discussions and pursuits.
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Cohomology and Poincare duality
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Hello, I am trying to understand Poincare duality at a concrete example. Consider X as the boundary of the embedded standard 2-simplex, i.e. X looks like this a / \ / \ v v b --- > c where the opposite edge of a,b,c gets the name A,B,C respectively.... more »
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My bio
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In the thread "Every Chess Configuration", Johannes Bauer wrote (sarcastically) about my biography (and I quote): ...As was explained in the aforementioned thread, my bio was put up there as a response to the Wiki editors requesting it (after they somehow learned, God knows how, that I've worked on tetration).... more »
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A set of approximations the central binomial coefficient
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An interesting type of approximation to the central binomial coefficient is of the form: C(2n, n) ~= 4^n / sqrt( Rm(n) ) Rm being a rational function of max. degree m+1 (m>0): Rm(n) = (pi n^(m+1) + sum(i=0,m) Pi n^i) / (n^m + sum(i=0,m-1) Qi n^i) and where the 2m+1 coefficients are defined by simply requiring exact... more »
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solutions manual
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solutions manual I am a solutions manual collector, I offer solutions manual ebook services Note: all solutions manual in soft copy that mean in Adobe Acrobat Reader (PDF ) format. if you want any book not just solutions just contact with us。 to get the solution manual you want ，please send message to... more »
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Book reference needed for self study
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Hello, Which book(s) will this ng recommend for self study in mathematics. I am looking for a book which gives me a solid foundation and insight in mathematics, starting from scratch. Thanks in advance.
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Check Polynomial for Convexity
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Let f:R^n --> R be a polynomial of n variables and non-negative coefficients and K := { (x_1, ..., x_n) \in R^n ; x_1+...+x_n = s } for some fixed s > 0. Are there any good characterizations for f being convex on K? Any that would be efficiently testable? I could provide a few more structural information on f, if that would help.... more »
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Short Mars travel times at high speed.
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The distance from Earth to Mars is about 60,000,000 km at closest approach. If we have a 30 km/sec initial velocity to Mars, which might be achievable with airbreathing(scramjet) or nuclear propulsion then the travel time might be 23 days if you make a simplifying assumption of a straight-line trip. However, the time required to make the... more »
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