2,856 reputation
1619
bio website
location Spain , Basque Country , Bilbao
age
visits member for 3 years, 2 months
seen Nov 26 at 13:24

i got a degree on Physics and have several ideas on my own , unfortunately i do not have a physics sponsor :) in order to get an investigation grant :)


Jun
14
asked Harlan J. Brothers's approximation to $ e $ ad infinitum?
Jun
4
asked Borel and Abel resummation and zeta regularization
May
27
comment Logarithmic Equations
take the 3/4 power in both sides $ (5x+2)= 16^{3/4}=8 $ (use calculator) :) then $ 5x=8-2 $ and $ x=6/5 $
May
25
comment Summation with factorial terms (involving Laguerre polynomials)
rewrite $ x^{k } $ as a linear combination of Laguerre polynomials $ L_{m} (x) $ and use the orthogonality property $ \int_{0}^{\infty} L_{m}(x)L_{n}(x)exp(-x)dx =0 $
May
24
comment numerical approximation to logarithm
OK you are right perhapsh i should use this expression plus a power series involving teh difference $ln(x+1)-ln(x) $
May
23
comment numerical approximation to logarithm
so my expression should be $ ln(x)= x\int_{0}^{1} \frac{dt}{1+xt} $
May
23
asked numerical approximation to logarithm
May
22
accepted identity of polylogarithm
May
22
asked identity of polylogarithm
May
20
comment How to find inverse of the function $f(x)=\sin(x)\ln(x)$
you CAN ALWAYS invert the function numerically , try mathwolframalpha wolframalpha.com/input/?i=%5Cinv%7Bsin%28x%29ln%28x%29%7D
May
19
asked summation of this series as $ x \to \infty $ ??
May
18
comment Closed form for n-th anti-derivative of $\log x$
kurims.kyoto-u.ac.jp/~kyodo/kokyuroku/contents/pdf/1692-02.pdf
May
18
answered solve non linear differential equation: $y'\cdot\alpha+y+\beta\cdot e^{\delta\cdot y}+\theta = 0$
May
14
answered How to integrate $\int_0^\infty \frac{1}{1+y^4} dy$
May
10
answered How to prove $n$ is prime?
May
10
comment functional equation involving $ f(x/k) $
what does 'mathematica softwary' say ??
May
10
accepted functional equation involving $ f(x/k) $
May
10
asked functional equation involving $ f(x/k) $
May
6
answered Finding the derivative with functions inside, such as $g(x) = \dfrac{3x-1}{f(x)}$
May
2
comment Differential Equation $y'=4|y|^{3/4}, y(0)=0$
takning integration with respect to x , since $ y=y(x) $ then we have the implicit relation $ 4x+C=|y|^{1/4} $ applying the condition $ y(0)=0 $ we get 4.0+C= |y(0)|^{1/4}=0 $ so $ C=0 $