A category is
a collection of objects
a collection of pairwise morphisms between objects in the collection
Compositions of morphisms can be constructed such that if f o A->B and g o B->C, then f o g A->C
Laws of categories
Morphism compositions are associative, such that (f o g) o h = f o (g o h)
Secondly, the category needs to be closed under the composition operation. So if {\displaystyle f:B\to C} and {\displaystyle g:A\to B}, then there must be some morphism {\displaystyle h:A\to C} in the category such that {\displaystyle h=f\circ g}.
There exists an identity morphism
There exist constructs that are both categories and objects, for example the holon.
Any time a multi-way relationship exists, i.e. a morphism