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# 10 Acknowledgement

We would like to thank the many people who have made contributions of various kinds to the development of GAP since 1986, in particular:

Isabel M. Araújo, Robert Arthur, Hans Ulrich Besche, Thomas Bischops, Oliver Bonten, Thomas Breuer, Frank Celler, Gene Cooperman, Bettina Eick, Volkmar Felsch, Franz Gähler, Greg Gamble, Willem de Graaf, Burkhard Höfling, Jens Hollmann, Derek Holt, Erzsébet Horváth, Alexander Hulpke, Ansgar Kaup, Susanne Keitemeier, Steve Linton, Frank Lübeck, Bohdan Majewski, Johannes Meier, Thomas Merkwitz, Wolfgang Merkwitz, James Mitchell, Jürgen Mnich, Robert F. Morse, Scott Murray, Joachim Neubüser, Max Neunhöffer, Werner Nickel, Alice Niemeyer, Dima Pasechnik, Götz Pfeiffer, Udo Polis, Ferenc Rákóczi, Sarah Rees, Edmund Robertson, Colva Roney-Dougal, Ute Schiffer, Jack Schmidt, Martin Schönert, Ákos Seress, Andrew Solomon, Heiko Theißen, Rob Wainwright, Alex Wegner, Chris Wensley and Charles Wright.

The following list gives the authors, indicated by `A`, who designed the code in the first place as well as the current maintainers, indicated by `M` of the various modules of which GAP is composed.

Since the process of modularization was started only recently, there might be omissions both in scope and in contributors. The compilers of the manual apologize for any such errors and promise to rectify them in future editions.

Kernel
  Frank Celler (A), Steve Linton (AM), Frank Lübeck (AM), Werner Nickel (AM), Martin Schönert (A)

Automorphism groups of finite pc groups
  Bettina Eick (A), Werner Nickel (M)

Binary Relations
  Robert Morse (AM), Andrew Solomon (A)

Characters and Character Degrees of certain solvable groups
  Hans Ulrich Besche (A), Thomas Breuer (AM)

Classes in nonsolvable groups
  Alexander Hulpke (AM)

Classical Groups
  Thomas Breuer (AM), Frank Celler (A), Stefan Kohl (AM), Frank Lübeck (AM), Heiko Theißen (A)

Congruences of magmas, semigroups and monoids
  Robert Morse (AM), Andrew Solomon (A)

Cosets and Double Cosets
  Alexander Hulpke (AM)

Cyclotomics
  Thomas Breuer (AM)

Dixon-Schneider Algorithm
  Alexander Hulpke (AM)

Documentation Utilities
  Frank Celler (A), Heiko Theißen (A), Alexander Hulpke (A), Willem de Graaf (A), Steve Linton (A), Werner Nickel (A), Greg Gamble (AM)

Factor groups
  Alexander Hulpke (AM)

Finitely presented groups
  Volkmar Felsch (A), Alexander Hulpke (AM), Martin Schoenert (A)

Finitely presented monoids and semigroups
  Isabel Araújo (A), Derek Holt (A), Alexander Hulpke (A), James Mitchell (M), Götz Pfeiffer (A), Andrew Solomon (A)

GAP for MacOS
  Burkhard Höfling (AM)

Group actions
  Heiko Theißen (A) and Alexander Hulpke (AM)

Homomorphism search
  Alexander Hulpke (AM)

Homomorphisms for finitely presented groups
  Alexander Hulpke (AM)

Identification of Galois groups
  Alexander Hulpke (AM)

Intersection of subgroups of finite pc groups
  Frank Celler (A), Bettina Eick (A), Werner Nickel (M)

Irreducible Modules over finite fields for finite pc groups
  Bettina Eick (AM)

Isomorphism testing with random methods
  Hans Ulrich Besche (AM), Bettina Eick (AM)

Lie algebras
  Thomas Breuer (A), Craig Struble (A), Juergen Wisliceny (A), Willem A. de Graaf (AM)

Monomiality Questions
  Thomas Breuer (AM), Erzsébet Horváth (A)

Multiplier and Schur cover
  Werner Nickel (AM), Alexander Hulpke (AM)

One-Cohomology and Complements
  Frank Celler (A) and Alexander Hulpke (AM)

Partition Backtrack algorithm
  Heiko Theißen (A), Alexander Hulpke (M)

Permutation group composition series
  Ákos Seress (AM)

Permutation group homomorphisms
  Ákos Seress (AM), Heiko Theißen (A), Alexander Hulpke (M)

Permutation Group Pcgs
  Heiko Theißen (A), Alexander Hulpke (M)

Possible Permutation Characters
  Thomas Breuer (AM), Götz Pfeiffer (A)

  Possible Class Fusions, Possible Power Maps Thomas Breuer (AM)

Primitive groups library
  Heiko Theißen (A), Colva Roney-Dougal (AM)

Properties and attributes of finite pc groups
  Frank Celler (A), Bettina Eick (A), Werner Nickel (M)

Random Schreier-Sims
  Ákos Seress (AM)

Rational Functions
  Frank Celler (A) and Alexander Hulpke (AM)

Semigroup relations
  Isabel Araujo (A), Robert F. Morse (AM), Andrew Solomon (A)

Special Pcgs for finite pc groups
  Bettina Eick (AM)

Stabilizer Chains
  Ákos Seress (AM), Heiko Theißen (A), Alexander Hulpke (M)

Strings and Characters
  Martin Schönert (A), Frank Celler (A), Thomas Breuer (A), Frank Lübeck (AM)

Structure Descriptions for Finite Groups
  Stefan Kohl (AM), Markus Püschel(A), Sebastian Egner(A)

Subgroup lattice
  Martin Schönert (A), Alexander Hulpke (AM)

Subgroup lattice for solvable groups
  Alexander Hulpke (AM)

Subgroup presentations
  Volkmar Felsch (A), Werner Nickel (M)

The Help System
  Frank Celler (A), Frank Lübeck (AM)

Tietze transformations
  Volkmar Felsch (A), Werner Nickel (M)

Transformation semigroups
  Isabel Araujo (A), Robert Arthur (A), Robert F. Morse (AM), Andrew Solomon (A)

Transitive groups library
  Alexander Hulpke (AM)

Two-cohomology and extensions of finite pc groups
  Bettina Eick (AM)

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GAP 4 manual
October 2007