From Online Dictionary of Crystallography
Revision as of 14:02, 1 April 2009 by BerndSouvignier
Loi de composition (Fr). Zweistellige Verknüpfung (Ge). Operación Binaria (Sp). Бинарная операция (Ru). Operazione binaria (It). 二項演算 (Ja).
Many binary operations are commutative (i.e. f(a,b) = f(b,a) holds for all a, b in S) or associative (i.e. f(f(a,b), c) = f(a, f(b,c)) holds for all a,b,c in S). Many also have identity elements and inverse elements. Typical examples of binary operations are the addition (+) and multiplication (*) of numbers and matrices as well as composition of functions or symmetry operations.
Examples of binary operations that are not commutative are subtraction (-), division (/), exponentiation(^), super-exponentiation(@), and composition.
Binary operations are often written using infix notation such as a * b, a + b, or a · b rather than by functional notation of the form f(a,b). Sometimes they are even written just by concatenation: ab.