Rational homotopy groups of the connected sum of two complex projective planes
= Rational homotopy groups of the connected sum of two complex projective planes
{title2=$\pi_2\otimes\mathbb Q=\pi_3\otimes\mathbb Q=\mathbb Q^2$}
The <Sullivan model of the connected sum of two complex projective planes> has two generators in each of degrees two and three, and none elsewhere. Its rational <homotopy groups> are therefore exactly the displayed two copies of $\mathbb Q^2$, with all other positive degrees zero.