Why did people constructed Quadratic Gauss Sum?
91020
Applications of Gauss sums
33184
Something strange about $\sqrt{ 4+ \sqrt{ 4 + \sqrt{ 4-x}}}=x$ and its friends
76892
Factoring inequalities on Double Summation (Donald Knuth's Concrete Mathematics)
52903
Sum of squares of dependent Gaussian random variables
38547
Why does the Euclidean algorithm for finding GCD work?
144335
Sum of three numbers and the sum of their squares: $x^2+y^2+z^2 \geq \frac{1}{3}$ for $x+y+z=1$
23270
The sum of powers of two and two's complement – is there a deeper meaning behind this?
114173
Explanation of the formulas for sums $\sum nr^n$ and $\sum n^2 r^n$
157652
Fermat's Last Theorem for Gaussian Integers (excluding the integers or  same pure imaginaries)
132081
Geometrical interpretation of $(\sum_{k=1}^n k)^2=\sum_{k=1}^n k^3$
145690
Quadratic algorithm for 4-SUM
110297
Problem related to quadratic equations
13960
Intuition for why sum of gaussian RVs is different from gaussian mixture
64314
Proof of certain Gaussian integral form
68080
Evaluation of $\sum_{k=0}^n{n\choose k}^2u^k$
90215
Proof/Derivation of Residual Sum of Squares (Based on Introduction to Statistical Learning)
21640
Why do we need vectors and who invented it?