/usr/share/gap/lib/addcoset.gd is in gap-libs 4r6p5-3.
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#W addcoset.gd GAP library Thomas Breuer
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#Y Copyright (C) 1996, Lehrstuhl D für Mathematik, RWTH Aachen, Germany
#Y (C) 1998 School Math and Comp. Sci., University of St Andrews, Scotland
#Y Copyright (C) 2002 The GAP Group
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## This file declares the operations for additive cosets.
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#C IsAdditiveCoset( <D> )
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## An additive coset is an external additive set whose additively acting
## domain is an additive group.
## The additive coset and its additively acting domain lie in the same
## family.
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## Note that additive cosets for non-commutative addition are not supported.
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DeclareCategory( "IsAdditiveCoset",
IsExtASet and IsAssociativeAOpESum and IsTrivialAOpEZero );
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#O AdditiveCoset( <A>, <a> )
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DeclareOperation( "AdditiveCoset", [ IsAdditiveGroup, IsAdditiveElement ] );
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#E
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