Urelement

In set theory, a branch of mathematics, an urelement or ur-element (from the German prefix ur-, 'primordial') is an object (concrete or abstract) that is not a set, but that may be an element of a set.

Urelements are sometimes called "atoms" or "individuals."

See also

• Element (mathematics)
• Set (mathematics)

External links

• Urelement @ Wikipedia.org