# More Math Styled with Pure CSS

One thing under examination here is the new CSS border-radius
property that may be used to “round” border corners.

**From linear algebra:**

The companion matrix of a monic polynomial

ft=tn+cn−1tn−1+…+c2t2+c1t+c0

of degree n with coefficients in a field F is the matrix of
the linear map given by “multiplication by t” in the quotient
space

Ft⁄ftFt

with respect to the basis of that space given by the residue classes
{1,t,t2,…,tn−1}. That matrix is

000…0−c0100…0−c1010…0−c2001…0−c3⋮⋮⋮⋱⋮⋮000…1−cn−1.