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View:  Topic list, Topic summary Topics 1 - 10 of 196624  Older »
Description: Mathematical discussions and pursuits.
 

exp. integrators 
  Hi, I have to estimate the component which contains an exponential integrator It means : est:= Integrate( exp( (h-t)lambda )* Phi(t), t=x...x+h) where Phi=g'(x)-lambda*g(x). This is the part of my estimation of the local error h is a step and lambda is a stiff value -1,-10,-1000. I should use some Gauss quadrature but in this moment I do not have... more »
By Magdalena Moczydlowska  - 2:32pm - 1 new of 1 message    

TAN 5:7 "PRIME NUMBERS" FROM INVERSE19 MATHEMATICS 
  Your Mathematical theory should be "embarrased " about its Nuisance Primr number solution calling it Randon , murderous etc over 300 years, Since Inverse mathematics has clearly shown in these posts at Sci math that 1. Prime numbers are not random atall! 2. That Prime numbers are predictable by several means including... more »
By Inverse 19 mathematics  - 2:29pm - 2 new of 2 messages    

Rotation question 
  I understand that to rotate something thru 90 degrees clockwise, the formulas are: x' = 0*x + y y' = -x + 0*y So the line y = x becomes y = -x. But I can't get y = x^2 to become x = y^2. What stupid mistake am I making?
By Tim Walters  - 2:25pm - 3 new of 3 messages    

Area preserving transformation and local connectedness 
  Consider the space S={f in C^k(R^2,R^2), det(Df)=1 everywere} Is S locally connected in C^k? I mean: if f and g are in S and d(f,g)<eps can we find a continuous family f_t in S such that d(f_t,f)<eps?
By LordBeotian  - 12:02pm - 1 new of 1 message    

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BEAUTIFUL DEAD SCIENCE 
  Beautiful dead science: [link] "Like bronze idols that are hollow inside, Einstein built a cluster of "Potemkin villages," which are false fronts with nothing behind them. Grigori Potemkin (17391791) was a general-field marshal, Russian statesman, and favorite of Empress Catherine the Great. He is alleged... more »
By Pentcho Valev  - 6:03am - 2 new of 2 messages    

Cosmological Hypotenuse Conjecture.By Aiya-Oba 
  (4/c^2 + 96/c^2)^2 = (c^2/81x10^2)^2 - Aiya-Oba (Philosopher). Where 4, is ordinary matter- energy, 96 (74 + 22), is dark energy and matter, annd c^2, is the speed of light squared, as in Einstein"s equation (mc^2). Such that; (4/9x10^16 + 96/9x10^16)^2 = (9x10^2/81x10^2)^2... more »
By Aiya-Oba  - Mar 17 - 2 new of 2 messages    

MATHEMATICAL DEFINTION OF "MINUS 1" VALUE BY INVERSE 19 MATHEMATICS 
  Any value that is between 1 and 0.0000000001 (10), divisible by exact 10 . The minus 1 value of the inverse 1 value of 1/36 = 1/36-- x1/36 X1/36 X1/36 X1/36X1/36 X1/36= 0.0000000001 precise , Note this is X6 times exact for 1/36 1-1=-1=.0000000001 because 1 is stopped by 1 as a" basic mathematics... more »
By Inverse 19 mathematics  - Mar 17 - 2 new of 2 messages    

Lebesgue's choice in graphical vs. verbal understanding of geometry 
  I found mention of the following in _Geometry, A Comprehensive Course_, by Dan Pedoe, 1970. The following is a google translation: ...I guess Caron is saying that as a student he preferred Lebesgue's instruction, which included graphical approaches rather just the presentation of equations. I wonder what is the current practice of instruction in college geometry... more »
By Matt  - Mar 17 - 1 new of 1 message    

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