Bill O'Haran's user avatar
Bill O'Haran's user avatar
Bill O'Haran's user avatar
Bill O'Haran
  • Member for 6 years
  • Last seen more than a month ago
8 votes
Accepted

complex polynomial has zeroes only in the upper half plane

7 votes
Accepted

Example of a series!

6 votes
Accepted

Eigenvalues for a Real Symmertic Matrix

5 votes

If $P(E|F)=P(E|F^c)$ then $E$ and $F$ are independent.

5 votes

Find the solutions to:$\frac{d^2y}{dx^2}=\left(\frac{dy}{dx}\right)^2$.

5 votes

Find the derivative of $f$ at $2$

5 votes
Accepted

How to prove $\sqrt{x}f(x) \to 0$?

4 votes
Accepted

ways to walk on a hexagon to return to same point with n steps

4 votes

What's wrong with this proof that $\lim_{n \to\infty} a_{2n} = L$ implies $\lim_{n \to\infty} a_n = L$

4 votes
Accepted

Is there a formula for $(x+y+z)^n$?

4 votes

Prove by induction: $b_n=\frac{n^n}{n!}$, where $b_1 = 1$ and $b_{n+1} = \left(1+\frac{1}{n}\right)^n\times b_n$

4 votes
Accepted

Show $\langle p,q\rangle$ is an inner product on a vector space

3 votes
Accepted

Amount of all subsets of size $n$ in a set with $e$ elements

3 votes
Accepted

Linear dependence for this particular example

3 votes
Accepted

Showing that $\frac{1}{2\pi}\int^{2\pi}_{0}(2\cos\theta)^{2n}d\theta=\frac{(2n)!}{n!n!}$

3 votes

Coin Toss Experiment Problem

3 votes

How can I solve this Combination with indistinguishable-objects problem?

3 votes
Accepted

Prove that the multiples of two orthogonal eigenvectors with a matrix are also orthogonal

3 votes
Accepted

Expected number of edges - Modularity

3 votes
Accepted

Show that there exists an $\alpha \in (0,1)$ such that $\int_{0}^{\pi} x^{\alpha}\sin x dx=3$

3 votes

Determine polynomial function of degree 4.

3 votes
Accepted

Does εε = ε in formal languages?

3 votes

An entrance exam problem relating to sequences and limits

2 votes
Accepted

$\mid A \cap B \mid = 1$, combinatoric

2 votes
Accepted

Proof that $A^{-1} + A = 0$ holds only for $n \times n$ matrices, with n even

2 votes

Is this a quadratic equation? If not, how do you solve it?

2 votes
Accepted

cof($AB$) = cof($A$)$\cdot$cof($B$)

2 votes

What are the steps to Solve $N \cdot \log_2N = 10^6$ algebraically?

2 votes

How to solve $-1\leq \tan{x} \leq 1$

2 votes
Accepted

Show that $\sum_{k=0}^{n}\binom{n}{k}2^{2k} = 5^n$ $\forall n \in\mathbb{N}$