Explore: C [asterisk] Algebras

locally compact Hausdorff space. C*-algebras were first considered primarily for their use in quantum mechanics to model algebras of physical observables. This

vocalize it as star (as, for example, in the A* search algorithm or C*-algebra). An asterisk is usually five- or six-pointed in print and six- or eight-pointed

is commutative and A has the structure of an associative algebra over R. Involutive algebras generalize the idea of a number system equipped with conjugation

Plain text, programming languages, and calculators also use a single asterisk to represent the multiplication symbol, and it must be explicitly used;

a c 2 a {\displaystyle {\overset {}{\underset {}{x={\frac {-b\pm {\sqrt {b^{2}-4ac}}}{2a}}}}}} Elementary algebra, also known as high school algebra or

algebra) the Hermitian conjugate of A {\displaystyle A} is commonly written as A ∗ {\displaystyle A^{\ast }} , but in quantum mechanics the asterisk (

(×) Other variants and related characters: U+002A * ASTERISK (*, *) U+2217 ∗ ASTERISK OPERATOR (∗) U+2062 INVISIBLE TIMES (⁢

convolution appears notably in the definition of Hopf algebras (Kassel 1995, §III.3). A bialgebra is a Hopf algebra if and only if it has an antipode: an endomorphism

(The asterisk is used to indicate outright ungrammaticality.) Other sources go further and use several symbols (e.g. the question mark and the asterisk plus

Hazewinkel, Michiel; Gubareni, Nadiya M. (2017), Algebras, Rings and Modules, Volume 2: Non-commutative Algebras and Rings (2nd ed.), CRC Press} Horn, Roger