8,403 reputation
11039
bio website
location
age
visits member for 3 years, 6 months
seen 1 hour ago

olivier dot begassat dot cours at gmail dot com


Jan
13
reviewed Approve suggested edit on Rank of the sum of two matrices
Jan
13
reviewed Approve suggested edit on If $I =|{\int^{5}_{2} \frac{\sin x}{1+x^2} dx |}$ find interval of I.
Jan
12
reviewed Approve suggested edit on Vector Equation
Jan
12
reviewed Edit suggested edit on Existence of an orthogonal matrix that converts $AB$ to $BA$
Jan
12
revised Existence of an orthogonal matrix that converts $AB$ to $BA$
question rephrased, tag edited
Jan
12
reviewed Approve suggested edit on very simple limit question $\lim_{t\to0}\frac{t^2}{1-\cos^2t}$
Jan
12
reviewed Approve suggested edit on very simple limit question $\lim_{t\to0}\frac{t^2}{1-\cos^2t}$
Jan
12
reviewed Approve suggested edit on Countermonotonicity and minimum linear correlation coefficient
Jan
12
reviewed Approve suggested edit on What is the domain for this function involving arcsin?
Jan
12
reviewed Approve suggested edit on Find all real to real function satisfy this functional equation.! $f((x+y)/(x-y))=[f(x)+f(y)]/[f(x)-f(y)]$
Jan
9
reviewed Reject suggested edit on How to reduce the radical?
Jan
8
comment determinant of the linear transformation $T(X) =\frac{1}{2} (AX+XA)$
Have you tried computing its matrix (relative to the standard basis $(E_{i,j})$)?
Jan
8
reviewed Reject suggested edit on How do I calculate how many push-ups will be done in a year, if I start with 1 a day, the first week, 2/day the second, etc?
Jan
8
reviewed Leave Open Evaluate $ \sum_{n=1}^{\infty} \frac{\sin \ n}{ n } $ using the fourier series
Jan
8
comment is the closure of a subalgebra also a subalgebra?
If the topology on the function space (which you haven't explicited : are you using the compact open topology? EDIT : it seems you are using the Banach space structure on the bounded continuous funtions) is such that the natural operations of addition and multiplication are continuous, then yes, the closure of a subalgebra is a subalgebra.
Jan
7
reviewed Approve suggested edit on Factoring $s^2+4s+13$
Jan
7
reviewed Approve suggested edit on Algebra 2-Factoring sum of cubes by grouping
Jan
7
answered Help with a proof in Humphreys
Jan
6
reviewed Approve suggested edit on $3$ equations - > $2$ unknowns and also trigonometry
Jan
5
awarded  Custodian