New posts in Quadratic Forms

Clifford Algebras

Generalizing the 290 theorem.

Differentiate $f(x)=x^TAx$

If $[L:k]$ is odd, $f$ quadratic form over $k$, then $\exists$ zero in $k$ when $\exists$ zero in $L$

Every integer vector in $\mathbb R^n$ with integer length is part of an orthogonal basis of $\mathbb R^n$

Hessian matrix of a quadratic form

How to take the gradient of the quadratic form?

Isometry without injection and surjection

Proving an inequality with Cauchy-Schwarz

Determining if a quadratic polynomial is always positive