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Jul
20
revised Prove that $(n-1) \sum_1^n \cot(\theta_i) \leq \sum_1^n \tan(\theta_i) $
edited body
Jul
20
comment Prove that $(n-1) \sum_1^n \cot(\theta_i) \leq \sum_1^n \tan(\theta_i) $
@Macavity Alright, fixed the proof.
Jul
20
revised Prove that $(n-1) \sum_1^n \cot(\theta_i) \leq \sum_1^n \tan(\theta_i) $
added 340 characters in body
Jul
20
revised Prove that $(n-1) \sum_1^n \cot(\theta_i) \leq \sum_1^n \tan(\theta_i) $
added 340 characters in body
Jul
20
answered Prove that $(n-1) \sum_1^n \cot(\theta_i) \leq \sum_1^n \tan(\theta_i) $
Jul
20
revised Is it possible to choose $10$ distinct numbers from the set $\{0, 1, 2, . . . , 14\}$ so that various differences are all distinct?
added 17 characters in body
Jul
20
answered Is it possible to choose $10$ distinct numbers from the set $\{0, 1, 2, . . . , 14\}$ so that various differences are all distinct?
Jul
19
comment Find the Cosets of Subgroup $\langle 3 \rangle $ of $\mathbb{Z}$
What makes you think that $H = \{0, 1, 2 \}$?
Jul
19
comment Cover the grid graph with simple cycles
Right. I believe the answer is 3. For odd n, there are no solutions, but for even n there's always the "split into 3 by 2 cells".
Jul
19
awarded  Nice Answer
Jul
19
answered Prove that rational numbers $a,b$ are integers if $a+b$ and $ab$ are integers
Jul
18
comment Fibonacci $\equiv -1 \mod p^2$
Here's an interesting conjecture: If the period mod $p$ is $n$, then the period mod $p^2$ is $np$. Having the period mod $p^2$ be a multiple of $p$ is a necessary, but not sufficient, condition for there to be no such primes.
Jul
18
comment Fibonacci $\equiv -1 \mod p^2$
@WillJagy Other than p > 3, it satisfies the conditions
Jul
18
reviewed Leave Open Is this basic geometry with a 4 sided irregular polygon?
Jul
18
reviewed Close How can I prove the following equality
Jul
18
reviewed Close Basis for vector subspace of polynomials with complex coefficients of degree at most 3
Jul
18
reviewed Close Notation: the set of two-element subsets of $\Bbb N$
Jul
18
reviewed Close Proof for Simplifying Integral involving Gaussian and Error Function
Jul
18
reviewed Leave Open Calculating area of a parallelogram using length of two diagonals
Jul
18
reviewed Leave Open Solve a trigonometric equation ($\sin(β/2)=β/4$)