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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
- internalUseDirectSum -- Compute direct sum of two rings.
Methods
- internalUseDirectSum(Ring,Ring) -- see internalUseDirectSum -- Compute direct sum of two rings.
- pullback(RingMap,RingMap) -- Compute the pullback of a diagram of rings

For the programmer

The object Pullback is a package.