$\sum w^n u_n$ where $u_n$ is decreasing and $w$ is a root of unity
54374
Alternating Series Using Other Roots of Unity
44802
The $n$ complex $n$th roots of a complex number $z$
93820
Fermat's little theorem applied for $n$'th root existence $\!\bmod p$
15202
the root of $N$th transpose matrix
150300
Root of unity for $n+1$
87479
Closed form for $\sum_{k=0}^{n-p}\binom{n}{k}\binom{n}{p+k}$
20317
Proving $\sum_{k=1}^{n}{(-1)^{k+1} {{n}\choose{k}}\frac{1}{k}=H_n}$
46746
How to prove if $u\in W^{1,p}$, then $|u|\in W^{1,p}$?
127047
How to show that $\sum_{i=1}^n | \langle f, f_i\rangle |^2 \leq \Vert f \Vert^2$
25981
Prove that $\sum_{k=0}^n a_k x^k = 0$ has at least $1$ real root if $\sum_{k=0}^n \frac{a_k}{k+1} = 0$
116491
Closed form for $\sum_{k=0}^{m} {\binom {m}{k}} a^{k} (b+ck)^N$
41312
Question on primitive roots of unity
95513
Proving $W$ is a subspace of $P_{2}$
153612
Finding $g_i:\mathbb{R}^n\to\mathbb R$ s.t $f(x)=\sum\limits_{i=1}^nx_i\cdot g_i(x)$
145900
Proof of a double summation reduction identity
10920
$\delta_2(n)$ the sum of the squares of the positive divisors of $n$.
109760
Showing that the product of all $n$th Roots of Unity is $(-1)^{n+1}$