383 reputation
310
bio website
location Vietnam
age
visits member for 2 years, 2 months
seen Mar 4 at 14:07

Nov
11
accepted Find m satisfied $\dim(U^\perp) = 2$
Nov
11
accepted Find a shortest distance from point to $\operatorname{span} U$
Nov
9
accepted Find basis for $\ker T$ with $T:P_2 \to P_2: T(p(x)) = p(x) + p(-x)$
Nov
9
accepted find $rank(T)$ when $T: P_2\to P_2:T(p(x)) = p(x+1)$
Nov
6
accepted Find a basis of $\ker T$ and $\dim (\mathrm{im}(T))$ of a linear map from polynomials to $\mathbb{R}^2$
Nov
4
accepted Prove : $\rm{col}(B) \subseteq \rm{null}(A)$
Nov
4
accepted Is $ U = \{f(x)| f(x) \in P_{3}, \operatorname{deg} f(x) = 3\}$ a subspace of $P_{3}$?
Nov
2
accepted Find conditions for a polynomial $p$ to be in a vector space $U$
Nov
2
accepted Modulo equation : $\frac{n^{k+1}-1}{n-1} \equiv a{\pmod p}$
Aug
20
accepted Matrix Manipulation : trick to sum elements of vector
Jun
26
accepted Multi variable integral : $\int_0^1 \int_\sqrt{y}^1 \sqrt{x^3+1} \, dx \, dy$
Jun
26
accepted Find volume of region bound by $y=x, y=x^2$ around x-axis
Jun
15
accepted $s(x)$ is a arc length function, find $s'(x)$
Jun
15
accepted $f(1)=-3$ and $ f'(x)\geq7$ how small is $f(5)$?
Jun
12
accepted Lagrange's method to find min/max question
Jun
12
accepted Formula to estimate sum to nearly correct : $\sum_{n=0}^\infty\frac{(-1)^n}{n^3}$
Jun
7
accepted Partial Derivation: $\lim_{(x,y)\to(0,0)}\frac{x^2+\sin^2y}{2x^2+y}$
Jun
4
accepted Sum of two divergence series is always divergence series?
May
30
accepted Maple: how to solving composite function
May
22
accepted Evaluating $\int_{0}^{1} \sqrt{1+x^2} \text{ dx}$