Maximal torus
= Maximal torus
{title2=$T$}
A maximal torus is a connected compact abelian <Lie subgroup> maximal among such subgroups. Restricting a finite-dimensional <unitary representation> to it splits into one-dimensional weight characters. For <special unitary group> $\mathrm{SU}(2)$ it is the diagonal circle $\operatorname{diag}(z,z^{-1})$.