symmetric monoidal (∞,1)-category of spectra
A magma $(S,\cdot)$ is called unital if it has an identity element $1 \in S$, hence an element such that for all $x \in S$ it satisfies the equation
holds. The identity element is idempotent.
Some authors take a magma to be unital by default (cf. Borceux-Bourn Def. 1.2.1).
Examples include unital rings etc.
Last revised on January 26, 2020 at 02:00:39. See the history of this page for a list of all contributions to it.