Troy McClure
Reputation
363
Next privilege 500 Rep.
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 57m asked Closest positive definite matrix to arbitrary one Jan 29 awarded Tumbleweed Jan 22 revised Imaginary Change of Radix added 39 characters in body Jan 22 asked Imaginary Change of Radix Jan 19 comment 2nd order Eigenvalue Problem on a second thought, i cant see how any polynomial can satisfy the equation since the degree of f is always greater than f',f'' Jan 18 asked 2nd order Eigenvalue Problem Jan 14 comment $\sum_{n=1}^{\infty}\frac{\cos(n)}{n}=e^{-\pi}?$ so, sum(cos(n))=1/2? note that realpart(1/(1-exp(i*x)))=1/2 for all x Jan 14 accepted $\sum_{n=1}^{\infty}\frac{\cos(n)}{n}=e^{-\pi}?$ Jan 14 asked $\sum_{n=1}^{\infty}\frac{\cos(n)}{n}=e^{-\pi}?$ Dec 29 accepted Sampling the derivative of an inverse of a function Dec 29 comment Sampling the derivative of an inverse of a function but to plug into the formula i need to be able to compute either the inverse or its derivative, right? Dec 29 comment Sampling the derivative of an inverse of a function thanks, yes, this way i can generate pairs of $x,f^{-1}\prime(x)$ but how can i know $f^{-1}(x)$ on this case, to complete the triple? i cant access it directly Dec 29 revised Sampling the derivative of an inverse of a function added 93 characters in body Dec 29 asked Sampling the derivative of an inverse of a function Dec 21 accepted Minimal c satisfying $x+y-(xy)^c \geq 0$ for all $x,y\in [0,1]$ Dec 20 asked Minimal c satisfying $x+y-(xy)^c \geq 0$ for all $x,y\in [0,1]$ Nov 27 awarded Critic Nov 27 accepted $\cos(y\,\operatorname{acosh}(\exp(x)))$ is real for all real $x,y$ Nov 27 comment $\cos(y\,\operatorname{acosh}(\exp(x)))$ is real for all real $x,y$ @gammatester very nice Nov 27 comment $\cos(y\,\operatorname{acosh}(\exp(x)))$ is real for all real $x,y$ @rundavidrun thanks, nice observation. still can you prove that acosh(x) is pure imaginary for 0