7,560 reputation
21146
bio website
location Besançon, France
age 34
visits member for 2 years, 1 month
seen 2 hours ago

Mathematics is a hobby for me, and MSE helps me not to forget too much what I learned in university (MS in applied mathematics at Lyon 1). I like especially real and complex analysis, trigonometry, numerical analysis, finite groups theory, number theory and combinatorics. I am not allergic to other fields.

I like experimenting with a computer, but by hand as well, with a good old slide rule or a table of logarithms for computations.

Contact: arbautjc at gmail dot com


9h
reviewed Approve suggested edit on Solving Linear Recursion with backtracking
9h
comment A Ferris wheel has a radius of 20 m. Passengers get on halfway up on the right side.
@BMWurm Actually, I have since found this Wikipedia article about Colossus in Missouri, and according to this article, its speed is $16 km/h$. In the example above, the speed would be $13 km/h$. Hence, even if I still think it's very fast, it's not unheard of.
9h
comment bessels equation
I tried to translate to LaTeX, but it has to be checked.
9h
revised bessels equation
hopefully latexified, to be checked
9h
reviewed Edit a problem about the application of Banach-Steinhaus theorem
9h
revised a problem about the application of Banach-Steinhaus theorem
edited title
9h
reviewed Close Showing three points are collinear
1d
comment Symbols for “odd” and “even”
I wasn't aware of these, thank you, and +1 then
1d
revised Minimum value of $ f(x) = \frac{2+\sin x}{2+\cos x}$.
deleted 10 characters in body
Nov
23
reviewed Leave Closed find $\mathop {\lim }\limits_{n \to + \infty } \frac{1}{{n^2 }}\sqrt[n]{{\frac{{3n!}}{{n!}}}}$
Nov
23
reviewed Leave Closed Can anyone solve this ODE: $f''' - m^2 f' =-y$
Nov
23
reviewed Close The convergence of the multiplication of two convergent series?
Nov
23
reviewed Leave Open Specific piecewise-function SAT2 question
Nov
23
reviewed Close Why we always chose minimum Ratio in Simplex method?
Nov
23
revised What is the limit of this trig function?
added 43 characters in body
Nov
22
comment Parametric equation of a cone
In the case $z=\sqrt{4x^2+y^2}$, the base of the cone is not circular but elliptic. Notice that a cone is not limited to circular or elliptic bases, see the Wikipedia article on cone.
Nov
21
revised Algorithm for retrieving all the permutations (randomized) for a vector sequence 1…N with only unique values
deleted 2 characters in body
Nov
20
reviewed Close Answer for a question with limits of series
Nov
20
reviewed Close Prove that there exist at least two distinct real numbers a such that $f(x)=x^2$
Nov
20
reviewed Close second order homogenous linear ODE with variable coefficients