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Math420
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3 votes
1 answer
57 views

Dimension of the union of a 4-dimensional and 3-dimensional simplex

2 votes
4 answers
7k views

How to solve $ z^6 + z^3 + 1 = 0 $?

2 votes
3 answers
134 views

How to calculate the $\gcd(10^6 +1 , 10^2 +1)$?

2 votes
2 answers
245 views

How to work out the integral $\int e^x·\sqrt{1+e^x}$

1 vote
1 answer
93 views

Let $P ∈ R^{n×m}, Q ∈ R^{m×n}$ . How to show that if I + P Q is nonsingular then I + QP is also nonsingular?

1 vote
2 answers
29 views

Hypothesis testing: $1/25$ chance vs. $0.2$ claim

1 vote
1 answer
80 views

Simple matrix question about $\begin{bmatrix}a & b\\c & d\end{bmatrix}$

1 vote
1 answer
242 views

Finding the height of a trough through root finding methods

1 vote
0 answers
1k views

Secant Method; how many iterations needed for a certain accuracy?

1 vote
1 answer
267 views

Variance of product of i.i.d. random variables

1 vote
0 answers
79 views

Obtaining bilinear form from Quadratic form

0 votes
1 answer
352 views

How to find the periodic solution of the equation $d^3y/dx^3+ky=f(x)$

0 votes
0 answers
104 views

Describing the annihilator

0 votes
0 answers
50 views

3D vector representation of $H_2O$ molecule?

0 votes
0 answers
55 views

How to evaluate $\lim_{x\to0^+}(\frac{1}{x}-\ln(x))$

0 votes
1 answer
105 views

Finding $a$ such that these two vectors are orthogonal

0 votes
2 answers
283 views

How to integrate the function $ \sqrt{1+x^2}· x^5 $?

0 votes
0 answers
32 views

Spectrum of an operator besides its eigenvalues

0 votes
1 answer
445 views

What's the difference between Lagrange interpolation and piecewise (Lagrange) interpolation?

0 votes
1 answer
38 views

Elementary divisors of the multiplicative group $(Z/99Z)^× × (Z/56Z)^×$

0 votes
1 answer
80 views

Intersection point of projective lines

0 votes
1 answer
53 views

Calculating the derivative of $f(t) = s - (m\cdot g/k)\cdot t+\left(m^2\cdot g/k^2\right)\cdot (1-\exp{(-k*t/m)})$

0 votes
1 answer
252 views

How to prove there is no rational number r that satisfies $6^r=10$?

0 votes
1 answer
97 views

How to show that $M$ is nonsingular (iff $A-BC$ = nonsingular)$\begin{bmatrix}A&B\\C&I\\\end{bmatrix}$

0 votes
2 answers
86 views

How to solve $-\frac{1}{2}gt^2\sin \theta=x$ when $x$ equals $0$

0 votes
1 answer
213 views

Two questions on Let $A ∈ R^{n×n}, B ∈ R^{n×m}, C ∈ R^{m×n}, and D ∈ R^{m×m}$. ...

0 votes
1 answer
50 views

What do these operations mean? $A ∩ B$ or $ A ∪ B$ or $A^c$?

0 votes
1 answer
674 views

Why does $P(E \cup F) = P(E) + P(F) − P(E \cap F)$ hold?

0 votes
1 answer
70 views

Why is this Markov chain irreducible?

0 votes
2 answers
50 views

Probability theory question