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3 Slice categories
 3.1 GAP categories
 3.2 Global variables
 3.3 Attributes
 3.4 Constructors
 3.5 Operations

3 Slice categories

3.1 GAP categories

3.1-1 IsSliceCategory
‣ IsSliceCategory( arg )( filter )

Returns: true or false

The GAP category of a slice category.

3.1-2 IsCellInASliceCategory
‣ IsCellInASliceCategory( arg )( filter )

Returns: true or false

The GAP category of cells in a slice category.

3.1-3 IsObjectInASliceCategory
‣ IsObjectInASliceCategory( arg )( filter )

Returns: true or false

The GAP category of objects in a slice category.

3.1-4 IsMorphismInASliceCategory
‣ IsMorphismInASliceCategory( arg )( filter )

Returns: true or false

The GAP category of morphisms in a slice category.

3.1-5 IsSliceCategoryOverTensorUnit
‣ IsSliceCategoryOverTensorUnit( arg )( filter )

Returns: true or false

The GAP category of a slice category over the tensor unit.

3.1-6 IsCellInSliceCategoryOverTensorUnit
‣ IsCellInSliceCategoryOverTensorUnit( arg )( filter )

Returns: true or false

The GAP category of cells in a slice category over the tensor unit.

3.1-7 IsObjectInSliceCategoryOverTensorUnit
‣ IsObjectInSliceCategoryOverTensorUnit( arg )( filter )

Returns: true or false

The GAP category of objects in a slice category over the tensor unit.

3.1-8 IsMorphismInSliceCategoryOverTensorUnit
‣ IsMorphismInSliceCategoryOverTensorUnit( arg )( filter )

Returns: true or false

The GAP category of morphisms in a slice category over the tensor unit.

3.2 Global variables

3.2-1 CAP_INTERNAL_METHOD_NAME_LIST_FOR_SLICE_CATEGORY
‣ CAP_INTERNAL_METHOD_NAME_LIST_FOR_SLICE_CATEGORY( global variable )

3.3 Attributes

3.3-1 AmbientCategory
‣ AmbientCategory( S )( attribute )

Returns: a list

The ambient category of the slice category S.

3.3-2 BaseObject
‣ BaseObject( S )( attribute )

Returns: a CAP object

The base object of the slice category S.

3.3-3 BaseObject
‣ BaseObject( cell )( attribute )

Returns: a CAP object

The base object underlying cell.

3.3-4 UnderlyingMorphism
‣ UnderlyingMorphism( obj )( attribute )

Returns: a CAP morphism

The morphism in the ambient category underlying the slice category object obj.

3.3-5 SourceOfUnderlyingMorphism
‣ SourceOfUnderlyingMorphism( obj )( attribute )

Returns: a CAP object

The source of the morphism in the ambient category underlying the slice category object obj.

3.3-6 UnderlyingCell
‣ UnderlyingCell( mor )( attribute )

Returns: a CAP mor

The cell in the ambient category underlying the slice category morphism mor.

3.3-7 InclusionFunctor
‣ InclusionFunctor( S )( attribute )

Returns: a functor

The natural embedding functor from S to AmbientCategory(S).

3.3-8 DualOverTensorUnit
‣ DualOverTensorUnit( J )( attribute )

Returns: a CAP morphism

The argument is an object \(J \colon j \rightarrow 1\) in the slice category S over the tensor unit. The output is the dual morphism \(J^\vee \colon 1 \rightarrow \mathrm{\underline{Hom}}(j,1)\) in the ambient category of S.

3.4 Constructors

3.4-1 AsSliceCategoryCell
‣ AsSliceCategoryCell( mor, S )( operation )

3.4-2 /
‣ /( mor, S )( operation )

3.4-3 AsSliceCategoryCell
‣ AsSliceCategoryCell( A, mor, B )( operation )

3.5 Operations

3.5-1 MorphismFromCovariantArgumentOfInternalHom
‣ MorphismFromCovariantArgumentOfInternalHom( J, I )( operation )

Returns: a morphism

The natural morphism \(I \to \mathrm{\underline{Hom}}(J,I)\), where I and J are objects in a slice category over the tensor unit.

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