GAP (SgpViz) - Chapter 1: Introduction

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### 1. Introduction

The aim of this package is to turn GAP more user-friendly, at least for semigroup theorists. It requires the usage of external programs as is the case of `graphviz` [DE+], a software for drawing graphs developed at AT & T Labs, that can be obtained at http://www.graphviz.org/. It is used not only to draw right Cayley graphs of finite semigroups and Sch{\"u}zenberger graphs of finite inverse semigroups but also to visualize in the usual way the egg-box picture of a D-classe of a finite semigroup.
Important note: The version of `graphviz` to install should be greater or equal to 1.16.
Tcl/Tk should also be available in order to run the graphical interfaces (XAutomaton and XSemigroup) used to specify automata and semigroups.

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