In category theory, a branch of mathematics, the formal criteria for adjoint functors are criteria for the existence of a left or right adjoint of a given functor.
One criterion is the following, which first appeared in Peter J. Freyd's 1964 book Abelian Categories, an Introduction to the Theory of Functors:
Another criterion is:
See also Anafunctor
References
Bibliography
Further reading
https://topology.lmf.cnrs.fr/powerdomains-and-hyperspaces-v-more-theories/
External links