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5 Co-Heyting algebras
 5.1 Operations
 5.2 Stable internal coHom
 5.3 Add-methods
 5.4 Properties

5 Co-Heyting algebras

5.1 Operations

5.1-1 ConegationOnObjects
‣ ConegationOnObjects( a )( attribute )

Returns: an object

The argument is an object \(a\). The output is its co-negated object \(\ulcorner a\).

5.1-2 ConegationOnMorphisms
‣ ConegationOnMorphisms( alpha )( attribute )

Returns: a morphism in \(\mathrm{Hom}( \ulcorner b, \ulcorner a )\).

The argument is a morphism \(\alpha: a \rightarrow b\). The output is its negated morphism \(\ulcorner \alpha: \ulcorner b \rightarrow \ulcorner a\).

5.1-3 ConegationOnMorphismsWithGivenConegations
‣ ConegationOnMorphismsWithGivenConegations( s, alpha, r )( operation )

Returns: a morphism in \(\mathrm{Hom}( \ulcorner b, \ulcorner a )\).

The argument is an object \(s = \ulcorner b\), a morphism \(\alpha: a \rightarrow b\), and an object \(r = \ulcorner a\). The output is the negated morphism \(\ulcorner \alpha: \ulcorner b \rightarrow \ulcorner a\).

5.1-4 MorphismFromDoubleConegation
‣ MorphismFromDoubleConegation( a )( attribute )

Returns: a morphism in \(\mathrm{Hom}(\ulcorner\ulcorner a, a)\).

The argument is an object \(a\). The output is the morphism from the double conegation \(\ulcorner\ulcorner a \rightarrow a\).

5.1-5 MorphismFromDoubleConegationWithGivenDoubleConegation
‣ MorphismFromDoubleConegationWithGivenDoubleConegation( a, r )( operation )

Returns: a morphism in \(\mathrm{Hom}(\ulcorner\ulcorner a, a)\).

The arguments are an object \(a\), and an object \(r = \ulcorner\ulcorner a\). The output is the morphism from the double conegation \(\ulcorner\ulcorner a \rightarrow a\).

5.2 Stable internal coHom

5.2-1 StableInternalCoHom
‣ StableInternalCoHom( V, W )( operation )

Returns: a CAP object

Return the stable internal coHom: \(\mathrm{\underline{coHom}}(\mathrm{\underline{coHom}}(...\mathrm{\underline{coHom}}(V,W)...,W),W)\).

5.3 Add-methods

5.3-1 AddConegationOnMorphisms
‣ AddConegationOnMorphisms( C, F )( operation )

Returns: nothing

The arguments are a category \(C\) and a function \(F\). This operation adds the given function \(F\) to the category for the basic operation ConegationOnMorphisms. \(F: ( alpha ) \mapsto \mathtt{ConegationOnMorphisms}(alpha)\).

5.3-2 AddConegationOnMorphismsWithGivenConegations
‣ AddConegationOnMorphismsWithGivenConegations( C, F )( operation )

Returns: nothing

The arguments are a category \(C\) and a function \(F\). This operation adds the given function \(F\) to the category for the basic operation ConegationOnMorphismsWithGivenConegations. \(F: ( s, alpha, r ) \mapsto \mathtt{ConegationOnMorphismsWithGivenConegations}(s, alpha, r)\).

5.3-3 AddConegationOnObjects
‣ AddConegationOnObjects( C, F )( operation )

Returns: nothing

The arguments are a category \(C\) and a function \(F\). This operation adds the given function \(F\) to the category for the basic operation ConegationOnObjects. \(F: ( arg2 ) \mapsto \mathtt{ConegationOnObjects}(arg2)\).

5.3-4 AddMorphismFromDoubleConegation
‣ AddMorphismFromDoubleConegation( C, F )( operation )

Returns: nothing

The arguments are a category \(C\) and a function \(F\). This operation adds the given function \(F\) to the category for the basic operation MorphismFromDoubleConegation. \(F: ( a ) \mapsto \mathtt{MorphismFromDoubleConegation}(a)\).

5.3-5 AddMorphismFromDoubleConegationWithGivenDoubleConegation
‣ AddMorphismFromDoubleConegationWithGivenDoubleConegation( C, F )( operation )

Returns: nothing

The arguments are a category \(C\) and a function \(F\). This operation adds the given function \(F\) to the category for the basic operation MorphismFromDoubleConegationWithGivenDoubleConegation. \(F: ( a, s ) \mapsto \mathtt{MorphismFromDoubleConegationWithGivenDoubleConegation}(a, s)\).

5.4 Properties

5.4-1 IsCoHeytingAlgebroid
‣ IsCoHeytingAlgebroid( C )( property )

Returns: true or false

The property of C being a co-Heyting algebroid.

5.4-2 IsCoHeytingAlgebra
‣ IsCoHeytingAlgebra( C )( property )

Returns: true or false

The property of C being a co-Heyting algebra.

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