Taxonomic Tree of GFO
GFO (General Formal ontology) draws a fundamental distinction between concrete entities, categories and sets. Sets are described by an axiomatic fragment of set theory of Zermelo-Fraenkel, although fragments of anti-foundation axiom set theories such as ZF-AFA are considered.
Concrete entities are entities which are in time and space, while categories have universal character.
Read more about this topic: General Formal Ontology
Famous quotes containing the word tree:
“Our courage breaks like an old tree in a black wind and dies,
But we have hidden in our hearts the flame out of the eyes
Of Cathleen, the daughter of Houlihan.”
—William Butler Yeats (1865–1939)