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 Tumbleweed
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  • 0 posts edited
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  • 18 votes cast
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<x<1?
Nov
27
revised $\cos(y\,\operatorname{acosh}(\exp(x)))$ is real for all real $x,y$
added 3 characters in body; edited title