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Mefitico's user avatar
Mefitico's user avatar
Mefitico
  • Member for 6 years, 5 months
  • Last seen more than a month ago
7 votes

the sequence $n!+2,...,n!+n$ is made up of only composite numbers

7 votes
Accepted

Let $x=1+\frac{1}{2+\frac{1}{1+\frac{1}{2+\frac{1}{...}}}}$; then the value of $(2x-1)^2$ equals...

6 votes

Evaluate $\oint_C \frac{e^{2z}}{(z-1)^4} \mathrm dz$

6 votes
Accepted

Solve the following equation: $\sin x \cos x = \frac{1}{2}$

5 votes

solve $\lim_{x\rightarrow -5} \frac{2x^2-50}{2x^2+3x-35}$

4 votes

Interpretation of the Derivative

3 votes

Prove $[A, B] = I \implies [A,B^m] = mB^{m-1}$

3 votes
Accepted

Zero by zero division and complex variable.

3 votes

If $f\geq0 , f(0)=f(1)=0$,and $\int_0^1|f''|/f dx$ exists,how to prove $\int_0^1f''/f dx\geq \pi^2$

3 votes
Accepted

Quaternionic analysis motivation

3 votes
Accepted

Is the expectation of the minimum of a function equal to the minimum of the expectation?

2 votes

Maximum/minimum with second derivative $= 0$

2 votes

How to solve the following system of linear inequalities?

2 votes

What conditions must be satisfied to prove that a function is non-negative?

2 votes

Intuitive/Visual solution for: There are $k$ balls in a bowl. How many draws does it on average take, to get one specific ball?

2 votes

Strong induction problem solution to $n! > 2^n,$ is it correct?

2 votes

Why is $\lim_{ n\rightarrow \infty} \frac{1}{n} \sum_{h < n} f(h) = \lim_{ n\rightarrow \infty} f(n) $.

2 votes

A function $f(x)$ not continuous at 0 such that $\left[f(x)\right]^3$ is continuous at 0.

2 votes

Find new first integral of DE System

2 votes
Accepted

Trouble with argument in a complex number

2 votes

Consider the Fibonacci sequence $\{a_n\}$

2 votes
Accepted

Integration $\int_0^t x^{5n-1}\ e^{-x/a}\ \mathrm dx$ without Gamma function

2 votes

Find all orthonormal bases of $\mathbb{R^2}$

2 votes

How to find the solution of a Numerical Reasoning Problem

2 votes
Accepted

Matlab code for iterated function system

2 votes
Accepted

Solving $\int^b_0x=\int^b_0\cos x$

2 votes
Accepted

Why is $0$ a pole of first order of $\frac{1}{e^z-1}$?

2 votes

Solutions to $\prod_{n=1}^\infty \left ( 1+ \frac1{f(n)} \right ) = \varphi$

2 votes

Why is $\sqrt{ab}$ = $\sqrt{a}\sqrt{b}$ not true when a and b are both negative?

1 vote

If $a_1= \sqrt{6}$ and $a_{n+1} = \sqrt{6 + a_n}$, what is the limit of $a_n$ as $n$ goes to infinity?