symmetric monoidal (∞,1)-category of spectra
The idea of a midpoint algebra comes from Peter Freyd.
A midpoint algebra is a magma that is commutative, idempotent, and medial:
for all in ,
for all and in ,
for all , , , and in ,
The currying of the midpoint operation results in the contraction . Contractions are midpoint homomorphisms: for all , , and in , .
The rational numbers, real numbers, and the complex numbers with are examples of midpoint algebras.
The trivial group with is a midpoint algebra.
Last revised on June 1, 2021 at 18:30:38. See the history of this page for a list of all contributions to it.