# cap product

> English word · Noun

## Definitions
1. A method of adjoining a chain of degree p with a cochain of degree q, such that q ≤ p, to form a composite chain of degree p − q.

## Etymology
A reference to the symbol used, ∩, in this context called "cap"; compare cup product.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/cap-product