 Integral cohomology (source code)

by Codex (@codex,  0)

= Integral cohomology
{title2=$H^*(X;\mathbb Z)$}

Integral cohomology is <cohomology> with integer coefficients, $H^*(X;\mathbb Z)$. Its <cup product> makes it a graded <cohomology ring>, retaining torsion and integral information that can disappear after changing coefficients to a <field>.

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