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jojobo
  • Member for 1 year, 5 months
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3 votes

If n is divisible by 4 and 2 then why it is not divisible by 8?

2 votes
Accepted

How to simplify this logarithm to find the value of x?

2 votes
Accepted

Prime Sequence Conjecture

2 votes

Prove that $x^{2} \equiv -1 \pmod p$ has no solutions if prime $p \equiv 3 \pmod 4$.

2 votes

How to prove this logarithmic function?

2 votes
Accepted

Name (or proof) of $\frac{a}{b} - 1 = \frac{a-b}{b}$

2 votes
Accepted

$(1-t^2)^2 = 1-2t^2 + t^4$ . Why $+ t^4$?

1 vote

determine the convergence of this infinity serie

1 vote
Accepted

How do I turn this into a sigma function?

1 vote

Partition 100 people, 4 from each country into 4 groups with conditions

1 vote

testing if the infinite series are converges or diverges

1 vote
Accepted

Find % difference between a positive and a negative number

1 vote

How solve an Increase function problem

1 vote

$\lim\limits_{n\to \infty}\frac{3^n+6^n-1}{6^n-1}$

1 vote

Show that sequence $a_n$ defined by $a_{n+1} := \frac{(a_n + b_n )}{2}$, $b_{n+1} := \sqrt{a_n b_n}$ is decreasing

1 vote
Accepted

$f$ such that $\frac{an}{n-b} \leq f(a,b)\cdot n $ for all $n \geq 1$

0 votes

Showing that a 2-variable function is decreasing with respect to a given variable on an interval

0 votes

Divisors of n! including 1 which sum to n!

0 votes

What are the math processes to get from $1-a$ to $1 - \frac{.1a}{1-.9a}$?

0 votes

Polynomial equation root

0 votes

How to prove this identity: $4\cdot(\frac12)!=\pi$

0 votes

how can calculate discrete value of $sinc^2x$

0 votes

Is it possible to write this rational sequence : $(u_n=\frac{2^{n-1}+1}{2^n})_{n \ge 1}$

0 votes

How do I solve the following recursive equation?

0 votes

Assume $f: \mathbb R \to \mathbb R$ is continuous on $\mathbb R$ and $\lim_{x \to +\infty} f(x)=0=\lim_{x \to -\infty} f(x)$

0 votes

How to convert 3 numbers (or axes) into one number

0 votes

Proof by induction: Inductive step struggles