Rational homotopy theory
= Rational homotopy theory
{title2=$\pi_*(X)\otimes\mathbb Q$}
Study <homotopy> after killing torsion, especially for <simply connected> spaces of finite type. The <rational Whitehead theorem> detects rational <homotopy> equivalences by rational <homology>, while <Sullivan minimal models> encode rational <homotopy> generators and cohomological relations.