Categories are the main GAP objects in CAP. They are used to associate GAP objects which represent objects and morphisms with their category. By associating a GAP object to the category, one of two filters belonging to the category (ObjectFilter/MorphismFilter) are set to true. Via Add methods, functions for specific existential quantifiers can be associated to the category and after that can be applied to GAP objects in the category. A GAP category object also knows which constructions are currently possible in this category.
| Package Version | Update ID | Released | Package Hub Version | Platforms | Subpackages |
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| 2017.09.25-bp153.1.12 info | GA Release | 2021-02-26 | 15 SP3 |
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| 2017.09.25-bp152.3.13 info | GA Release | 2020-04-17 | 15 SP2 |
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| 2017.09.25-bp151.3.1 info | GA Release | 2019-07-17 | 15 SP1 |
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| 2017.09.25-bp151.2.10 info | GA Release | 2019-05-18 | 15 SP1 |
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| 2017.09.25-bp150.1.3 info | GA Release | 2018-07-30 | 15 |
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