Dear GAP-Forum,

Sergei Haller asked:

If ZeroMatrix and NullMatrix do not exist, why they are offered by the
``TAB-feature''

Once you use identifier names, they are stored for command completion, even
if the variable is not bound and the prior use had led to a syntax error:

gap> NonexitingFunction();
Variable: 'NonexitingFunction' must have a value
gap> Non<TAB>
NonLieNilpotentElement
NonNilpotentElement
NonPerfectCSPG
NonSplitExtensions
NonTrivialRightHandSides
NonassocWord
NonexitingFunction <-----
NonnegIntScalarProducts
NonnegativeIntegers

Best regards,

Alexander Hulpke