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# 3 General concepts

### Sections

1. Introduction
2. How partial difference sets are represented
3. Basic functions for startset generation
4. A brute force method

In this chapter, we first give a definition of relative difference sets and outline a part of the theory. Then we have a quick look at the way difference sets are represented in RDS.

After that, some basic methods for the generation of difference sets are explained.

If you already read chapter RDS:A quick start and want to know what `StartsetsInCoset` really does, you may want to read this chapter (and the following one, of course). The main high-level function in this chapter is `ExtendedStartsets`.

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