the union of the relative complements of two sets.
noun, Mathematics. 1. a polynomial in several indeterminates that stays the same under any permutation of the indeterminates.
noun, Mathematics. 1. the group of all permutations of a finite set.
- Symmetric key cryptography
cryptography A cryptography system in which both parties have the same encryption key, as in secret key cryptography. Opposite: public-key cryptography. (1998-06-09)
- Symmetric lisp
A parallel Lisp in which environments are first-class objects. It is implemented in Common LISP. [“Parallelism, Persistence and Meta-Cleanliness in the Symmetric Lisp Processor”, D. Gelernter et al, SIGPLAN Notices 22(7):274-282 (July 1987)]. [“A Programming Language Supporting First-Class Parallel Environments”, S. Jagannathan, MIT-LCS/TR 434, 1989]. E-mail: Suresh Jagannathan . (1995-03-16)