Pullback  pullback in the category of rings
Description
Pullback is a package that implements pullback for diagrams of rings
Caveat
Works only for maps of rings finitely generated over a base field and one of the two maps is surjective
Authors

Drew Ellingson

Karl Schwede
Version
This documentation describes version 1.03 of Pullback.
Source code
The source code from which this documentation is derived is in the file Pullback.m2.
Exports

Functions and commands

Methods

"internalUseDirectSum(Ring,Ring)"  see internalUseDirectSum  Compute direct sum of two rings.

"pullback(RingMap,RingMap)"  see pullback  Compute the pullback of a diagram of rings