abstract:In mathematics, specifically in algebraic topology, the cup product is a method of adjoining two cocycles of degree p and q to form a composite cocycle of degree p + q. This defines an associative (and distributive) graded commutative product operation in cohomology, turning the cohomology of a space X into a graded ring, H∗(X), called the cohomology ring.
The New York Times this past weekend included an article describing the World Cup soccer jerseys as an example of a green product that is not from a green company (Nike).