Cohomology ring
= Cohomology ring
{title2=$H^*(X;R)$}
{wiki}
The cohomology ring is the graded ring whose multiplication is the <cup product>. It records intersection information that the graded cohomology groups alone do not detect.
= Cohomology ring
{title2=$H^*(X;R)$}
{wiki}
The cohomology ring is the graded ring whose multiplication is the <cup product>. It records intersection information that the graded cohomology groups alone do not detect.