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Pullback -- pullback in the category of rings


Pullback is a package that implements pullback for diagrams of rings


Works only for maps of rings finitely generated over a base field and one of the two maps is surjective


  • Drew Ellingson
  • Karl Schwede


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.


  • 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

For the programmer

The object Pullback is a package.