[GAP Forum] Filter trouble

[Marc Roeder]

Dear GAP Forum,

Stefan Kohl wrote:

> The point is that `IsCyc' resp. `IsCyclotomic' denotes elements of
> the "Category" of Cyclotomics (note that "Category" in the GAP sense
> means something different than in category theory -- see ?Categories),
> but `IsIntegralCyclotomic' is a property.

Thank you.

Is there a way to know which filters are Categories and which are Properties (something like IsCategory)? And is there a way to know which Properties of an object are stored after calculation (to use RedispatchOnCondition)?

Guessing Categories seems to be a little  bit difficult, as for example
IS_INT(2) is true, while CategoryCollections(IS_INT)([2]) is false.

Best regards,

Marc

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