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Let be a Archimedean directed ordered type integral domain , with let adense be astrict order , - and letpremetric space , be and the letsemiring? of be positive a terms innet . with index type. A -modulus of Cauchy convergence is a function with a type
Suppose is a -premetric space, and let be a net with index type . A -modulus of Cauchy convergence is a function with a type
The composition of a net and a -modulus of Cauchy convergence is also a net.
A -Cauchy approximation is the composition of a net and a -modulus of Cauchy convergence .
Auke B. Booij, Analysis in univalent type theory (pdf)
Univalent Foundations Project, Homotopy Type Theory – Univalent Foundations of Mathematics (2013)