# CapAndHomalg.jl ^{}

### Simplified access to the repositories of the GitHub organization homalg-project

Documentation |
Build Status |
GitHub Actions |
---|---|---|

## Introduction

The Julia package `CapAndHomalg`

provides simplified access to the repositories of the GAP packages hosted on the GitHub organization homalg-project, most of which are based on the

These are open source GAP multi-package projects for constructive category theory and homological algebra with applications to module theory of commutative and non-commutative algebras and algebraic geometry.

## Installation

#### Install Julia

To install Julia follow the first Steps 0 and 1 on our installation page.

#### Install `CapAndHomalg.jl`

Then start `julia`

in a terminal and add the package `CapAndHomalg`

:

julia> using Pkg; Pkg.add("CapAndHomalg")
julia> using CapAndHomalg

For more information on the included GAP packages see the documentation.

The correctness of the installation and the availability of the functionality can at any time be tested using

julia> using Pkg; Pkg.test("CapAndHomalg")

After each update of the Julia package `GAP`

a rebuild is (probably) necessary:

julia> using Pkg; Pkg.build("CapAndHomalg")

## Software dependency

`CapAndHomalg`

relies on the

computer algebra systems | through the Julia packages |
---|---|

GAP | Gap.jl |

Singular | Singular_jll.jl |

all of which are components of the computer algebra system OSCAR.

Some of the bundled packages use the GAP packages

and the

third party software | through the GAP packages | and the Julia packages |
---|---|---|

Graphviz | dot-format generating code like in Digraphs | Graphviz_jll.jl |

4ti2 | 4ti2Interface | lib4ti2_jll.jl |

## General Disclaimer

The software comes with absolutely no warranty and will most likely have errors. If you use it for computations, please check the correctness of the result very carefully.

This software is licensed under the LGPL, version 3, or any later version.

## Funding

*The development of this package and many of the GAP packages hosted on the GitHub organization homalg-project was partially funded by the DFG (German Research Foundation) through the*