| ‣ IsGeneralizedMorphismCategoryByCospansObject( object ) | ( filter ) | 
Returns: true or false
The GAP category of objects in the generalized morphism category by cospans.
| ‣ IsGeneralizedMorphismByCospan( object ) | ( filter ) | 
Returns: true or false
The GAP category of morphisms in the generalized morphism category by cospans.
| ‣ HasIdentityAsReversedArrow( alpha ) | ( property ) | 
Returns: true or false
The argument is a generalized morphism \(\alpha\) by a cospan \(a \rightarrow b \leftarrow c\). The output is true if \(b \leftarrow c\) is congruent to an identity morphism, false otherwise.
| ‣ UnderlyingHonestObject( a ) | ( attribute ) | 
Returns: an object in \(\mathbf{A}\)
The argument is an object \(a\) in the generalized morphism category by cospans. The output is its underlying honest object.
| ‣ Arrow( alpha ) | ( attribute ) | 
Returns: a morphism in \(\mathrm{Hom}_{\mathbf{A}}(a,c)\)
The argument is a generalized morphism \(\alpha\) by a cospan \(a \rightarrow b \leftarrow c\). The output is its arrow \(a \rightarrow b\).
| ‣ ReversedArrow( alpha ) | ( attribute ) | 
Returns: a morphism in \(\mathrm{Hom}_{\mathbf{A}}(c,b)\)
The argument is a generalized morphism \(\alpha\) by a cospan \(a \rightarrow b \leftarrow c\). The output is its reversed arrow \(b \leftarrow c\).
| ‣ NormalizedCospanTuple( alpha ) | ( attribute ) | 
Returns: a pair of morphisms in \(\mathbf{A}\).
The argument is a generalized morphism \(\alpha: a \rightarrow b\) by a cospan. The output is its normalized cospan pair \((a \rightarrow d, d \leftarrow b)\).
| ‣ PseudoInverse( alpha ) | ( attribute ) | 
Returns: a morphism in \(\mathrm{Hom}_{\mathbf{G(A)}}(b,a)\)
The argument is a generalized morphism \(\alpha: a \rightarrow b\) by a cospan. The output is its pseudo inverse \(b \rightarrow a\).
| ‣ GeneralizedInverseByCospan( alpha ) | ( attribute ) | 
Returns: a morphism in \(\mathrm{Hom}_{\mathbf{G(A)}}(b,a)\)
The argument is a morphism \(\alpha: a \rightarrow b \in \mathbf{A}\). The output is its generalized inverse \(b \rightarrow a\) by cospan.
| ‣ IdempotentDefinedBySubobjectByCospan( alpha ) | ( attribute ) | 
Returns: a morphism in \(\mathrm{Hom}_{\mathbf{G(A)}}(b,b)\)
The argument is a subobject \(\alpha: a \hookrightarrow b \in \mathbf{A}\). The output is the idempotent \(b \rightarrow b \in \mathbf{G(A)}\) by cospan defined by \(\alpha\).
| ‣ IdempotentDefinedByFactorobjectByCospan( alpha ) | ( attribute ) | 
Returns: a morphism in \(\mathrm{Hom}_{\mathbf{G(A)}}(b,b)\)
The argument is a factorobject \(\alpha: b \twoheadrightarrow a \in \mathbf{A}\). The output is the idempotent \(b \rightarrow b \in \mathbf{G(A)}\) by cospan defined by \(\alpha\).
| ‣ NormalizedCospan( alpha ) | ( attribute ) | 
Returns: a morphism in \(\mathrm{Hom}_{\mathbf{G(A)}}(a,b)\)
The argument is a generalized morphism \(\alpha: a \rightarrow b\) by a cospan. The output is its normalization by cospan.
| ‣ GeneralizedMorphismFromFactorToSubobjectByCospan( beta, alpha ) | ( operation ) | 
Returns: a morphism in \(\mathrm{Hom}_{\mathbf{G(A)}}(c,a)\)
The arguments are a a factorobject \(\beta: b \twoheadrightarrow c\), and a subobject \(\alpha: a \hookrightarrow b\). The output is the generalized morphism by cospan from the factorobject to the subobject.
| ‣ GeneralizedMorphismByCospan( alpha, beta ) | ( operation ) | 
Returns: a morphism in \(\mathrm{Hom}_{\mathbf{G(A)}}(a,c)\)
The arguments are morphisms \(\alpha: a \rightarrow b\) and \(\beta: c \rightarrow b\) in \(\mathbf{A}\). The output is a generalized morphism by cospan with arrow \(\alpha\) and reversed arrow \(\beta\).
| ‣ GeneralizedMorphismByCospan( alpha, beta, gamma ) | ( operation ) | 
Returns: a morphism in \(\mathrm{Hom}_{\mathbf{G(A)}}(a,d)\)
The arguments are morphisms \(\alpha: a \leftarrow b\), \(\beta: b \rightarrow c\), and \(\gamma: c \leftarrow d\) in \(\mathbf{A}\). The output is a generalized morphism by cospan defined by the composition the given three arrows regarded as generalized morphisms.
| ‣ GeneralizedMorphismByCospanWithSourceAid( alpha, beta ) | ( operation ) | 
Returns: a morphism in \(\mathrm{Hom}_{\mathbf{G(A)}}(a,c)\)
The arguments are morphisms \(\alpha: a \leftarrow b\), and \(\beta: b \rightarrow c\) in \(\mathbf{A}\). The output is a generalized morphism by cospan defined by the composition the given two arrows regarded as generalized morphisms.
| ‣ AsGeneralizedMorphismByCospan( alpha ) | ( attribute ) | 
Returns: a morphism in \(\mathrm{Hom}_{\mathbf{G(A)}}(a,b)\)
The argument is a morphism \(\alpha: a \rightarrow b\) in \(\mathbf{A}\). The output is the honest generalized morphism by cospan defined by \(\alpha\).
| ‣ GeneralizedMorphismCategoryByCospans( A ) | ( attribute ) | 
Returns: a category
The argument is an abelian category \(\mathbf{A}\). The output is its generalized morphism category \(\mathbf{G(A)}\) by cospans.
| ‣ GeneralizedMorphismByCospansObject( a ) | ( attribute ) | 
Returns: an object in \(\mathbf{G(A)}\)
The argument is an object \(a\) in an abelian category \(\mathbf{A}\). The output is the object in the generalized morphism category by cospans whose underlying honest object is \(a\).
| ‣ AsGeneralizedMorphismByCospan( F, name ) | ( operation ) | 
Lift the exact functor F to a functor \(A \to B\), where \(A := \) GeneralizedMorphismCategoryByCospans( AsCapCategory( Source( F ) ) ) and \(B := \) GeneralizedMorphismCategoryByCospans( AsCapCategory( Range( F ) ) ).
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