Nevertheless, abstract algebra can consider the field with one element, which is not a singleton and is not a set at all. 1 is the most common leading digit in many sets of data, a consequence of Benfords law. 1 is the only known Tamagawa number for a simply connected algebraic group over a number field.
Contrary to pleomorphic adenoma, it is non recurrent. See also
Pleomorphic adenoma

References
Additional sources
Kahn, Michael A. Basic Oral and Maxillofacial Pathology. Volume 1. 2001. == External links ==