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# The Crime Package

Version 1.1

Marcus Bishop
e-mail: marcus.bishop@gmail.com

### Copyright

(C) 2006 Marcus Bishop

We adopt the copyright regulations of GAP as detailed in the copyright notice in the GAP manual.

### Acknowledgements

This project would not have been possible without Jon Carlson. Jon devised the algorithms used by `ProjectiveResolution`, `CohomologyGenerators`, and `CohomologyRelators`, having already implemented them in Magma and sharing these programs with me.

### Contents

1. Installation and Loading
2. Usage
2.1 Cohomology Objects
2.1-1 CohomologyObject
2.2 Minimal Projective Resolutions
2.2-1 ProjectiveResolution
2.2-2 BoundaryMap
2.3 Cohomology Generators and Relators
2.3-1 CohomologyGenerators
2.3-2 CohomologyRelators
2.4 Tests for Completion
2.5 Cohomology Rings
2.5-1 CohomologyRing
2.5-2 IsHomogeneous
2.5-3 Degree
2.5-4 LocateGeneratorsInCohomologyRing
2.6 What Happens if `n` Isn't Big Enough?
2.7 Induced Maps
2.7-1 InducedHomomorphismOnCohomology
2.7-2 Inclusion
2.8 Massey Products
2.8-1 MasseyProduct
3. Leisure and Recreation: Cohomology Rings of all Groups of Size 16

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