9,054 reputation
11546
bio website
location
age
visits member for 3 years, 10 months
seen 6 hours ago

1d
comment Suggestions for projects in mathematics of finance
Did you ever find your answer in another community?
Aug
26
comment Suggestions for projects in mathematics of finance
Did you ever find what you were looking for?
Aug
19
revised Some questions about sub-fields of the field of complex numbers
added 61 characters in body
Aug
12
awarded  Generalist
Aug
1
comment Period of trigonometric function
If you have some numbers $a_1,a_2,\ldots,a_n$. The least common multiple is the smallest number so that each $a_i$ divides it. For instance, the least common multiple of $2$, $3$, and $8$ is $24$ because it is the smallest number that all of $2$, $3$, and $8$ divide.
Jul
29
comment Determining the infinite limit of a Riemann' sum
On the second line on your second page the $\frac{n^2+1}{2}$ should be $\frac{n^2+n}{2}$.
Jul
29
answered Does continuity of $f$ imply $f^{-1}(\bar A)\subset\overline{f^{-1}(A)}$?
Jul
29
revised Determining the infinite limit of a Riemann' sum
added 32 characters in body
Jul
29
comment Corollary to Smith normal form
@mvcouwen Well, $A'$ is still a homomorphism from $\mathbb{Z}^k$ to $\mathbb{Z}^k$. So, it is clearly true for $A'$.
Jul
29
comment Corollary to Smith normal form
@mvcouwen You don't. Since $P$ and $Q$ are isomorphisms, the images of $A$ and $A'$ are isomorphic. Thus they have the same index.
Jul
29
answered Corollary to Smith normal form
Jul
27
awarded  Popular Question
Jul
26
comment Solve inequality: $-5 < \frac{1}{x} < 0$
@hiisitmeyoulookingfor I edited the answer with more information.
Jul
26
revised Solve inequality: $-5 < \frac{1}{x} < 0$
added 44 characters in body; edited title
Jul
26
answered Solve inequality: $-5 < \frac{1}{x} < 0$
Jul
23
answered A set of all rational numbers in $[0, 1]$?
Jul
23
revised Dimension of the sum of three subspaces
added 24 characters in body
Jul
23
comment Dimension of the sum of three subspaces
For two subspaces $U_1$ and $U_2$, the subset $U_1+U_2$ is defined to be the subspace generated by sums $u_1+u_2$ for $u_1\in U_1$ and $u_2\in U_2$. So, $U_1+U_2$ is not the union.
Jul
22
comment Re professional mathematicians working on several problems at once. Source needed.
You probably need to be more specific. I've heard lots of mathematicians say that they have to work on several problems at once.
Jul
22
revised Discrete Mathematics Function Proof
added 2 characters in body