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Will Fisher
  • Member for 6 years, 7 months
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10 votes
Accepted

Horrible limit envolving floor function

9 votes

An integer is prime iff $\phi(n) \mid n-1$ and $n+1 \mid \sigma (n)$

7 votes
Accepted

Find $H'(x)$ if $H(x)=\int_{3}^{x^2} (\sin t)^3 dt$

6 votes

If you take the reciprocal in an inequality, would it change the $>/< $ signs?

6 votes
Accepted

Every odd divisor is $\equiv 1\bmod 3$

5 votes

Sumset that covers $\mathbb{Z}/p\mathbb{Z}$.

4 votes

Infinite decimal expression of rational numbers

4 votes

Prove that there exists a prime $p$ such that $p \mid a^n-b^n$ and $p > n$

4 votes
Accepted

Solving $\sin z = i$

4 votes

Find Area Enclosed by Curve

4 votes
Accepted

Proof for general solution of homogeneous second-order linear ODE?

4 votes
Accepted

I want to write a Christmas message only with particular zeta values. It is possible?

4 votes

Is it true that $0.999999999\ldots=1$?

4 votes

An iteration formula I found (please don't jump at me if it's already been discovered)

3 votes

Suppose $f_1,f_2 \in O(g)$. Let $f = sf_1 + tf_2$, where $s,t \in \mathbb R$. Prove that $f \in O(g)$

3 votes

Asymptotic behavior of $x_{n+1}=x_n+\frac{1}{x_n}, \space\space\space x_0=1$

3 votes

How to formally prove that index renaming doesn’t change sum

3 votes
Accepted

Uniformly approximating $f\in \mathcal{C}([1,\infty))$ with polynomials where $\underset{x\rightarrow +\infty}{\lim} f(x)=a$

3 votes

Maximum Value of $|\sum_{k=1}^n (-1)^{\lfloor ak/b\rfloor}|$

3 votes
Accepted

I would like to prove the following series: $\sum_{n=1}^\infty {\frac{\sin{\frac{\pi}{n}}}{n}}\cdot(x-2)^n $ is convergent

3 votes
Accepted

linear regression for dummies

3 votes
Accepted

Properties of improper integral (showing that: $\int \limits_{0}^{\infty}f(x)dx=\int \limits_{0}^{1}f(x)dx+\int \limits_{1}^{\infty}f(x)dx.$)

3 votes
Accepted

Where is the definition of the derivative formula derived from?

3 votes

How to find $\int \frac{x^2-1}{x^3\sqrt{2x^4-2x^2+1}} dx$

3 votes
Accepted

Indefinite integral of a rational function with linear denominator: $ \int \frac{ x^7}{(x+1)}{dx} $

3 votes
Accepted

If $(A - \lambda I_n)$ is singular, then there exist $X \in M_n(\mathbb{C}), X \neq 0 $ such that $AX= \lambda X $

3 votes
Accepted

Finding closed form of a summation $\sum_{i = \lfloor{\frac{n}{2}}\rfloor}^{n}i$

3 votes
Accepted

Real Analysis - Uniform Continuity Question

3 votes

Find the minimum and maximum value of $h(x)$

2 votes
Accepted

Check , if the series converges whether it is absolutely converges or conditionally .

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