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Xoque55
  • Member for 8 years, 11 months
  • Last seen more than a week ago
21 votes
Accepted

Why use Gauss Jordan Elimination instead of Gaussian Elimination, Differences

20 votes

How to calculate the angle between 2 vectors in 3D space given a preset function

15 votes
Accepted

Show that any orthogonal matrix has determinant 1 or -1

11 votes
Accepted

Hyperbolic or exponential solutions to differential equation

11 votes

Is $\sin^2(x)$ the same as $\sin x^2$?

9 votes

Evaluating $\int_{-e}^e(x+x^3+x^5+\cdots+x^{999}) dx$

7 votes
Accepted

Is there a quicker way to check if this proposition is self contradictory?

6 votes
Accepted

If I found that a series converges, how can I know to what number it's converging to?

6 votes
Accepted

Too Many Books - Not Enough Time

5 votes

How to tell whether a function is probabilty distribution function?

5 votes
Accepted

Prove that $ABA^T$ is symmetric when $A$ and $B$ are symmetric matrices

4 votes
Accepted

Does this type of "cyclic" matrix have a name?

4 votes
Accepted

Find $a$, $b$, and $c$ so that $y=ax^2+bx+c$ passes through $(1,2)$, $(-1,6)$, and $(2,3)$

4 votes
Accepted

Closed form of summation with n+1 on top?

4 votes

Algorithms for Finding the Prime Factorization of an Integer

4 votes

Finding number with prime number of divisors?

3 votes

Pentagon construction

3 votes

Is it possible to know if such path in a graph exists?

3 votes

Integrate $ \int \sinh 2x \cosh x dx$

3 votes
Accepted

How to find the sum of a series?

3 votes

Proof that for all symmetric matrices $A$ and $B$, $AB=(BA)^T$.

3 votes
Accepted

Write exponent as iterative sums.

3 votes

$\int_0^{\infty} \frac{\sin x}{x}\frac{\sin \frac{x}{3}}{\frac{x}{3}} dx = \frac{\pi}{2}$ and more general results?

3 votes

$\sin^n (x)$ is it same as $(sin \: x)^n$ , n is a Natural number

2 votes

If d1 & d2 are matrics then 1/4d1 + 3/4d2 is metric or not.

2 votes

If a matrix has positive, real eigenvalues, is it always symmetric?

2 votes

Why does matrix exponentiation work with transposes?

2 votes

How to find the number of subsets of any given set that contain a particular number

2 votes

Website for plotting many linear equations

2 votes
Accepted

Looking for good intro book on differential equations