Asterisks are often used in mathematics, including:
* plural * * * plural yoke (usually expressed as \bar{z}).
* Free product of two groups
* infix representation of arbitrary binary operation.
* convolution, such as f? G is the convolution of f and g.
Multiplication group of * rings, especially when this ring is a domain, such as \ mathbb {c} * = \ mathbb {c \ {0 \}}-
* Any point in a set, such as calculating riemann sum or shrinking a simply connected group into a single element group {? }。
The dual space symbol of * vector space V is V*.
* The smooth mapping f between two smooth manifolds is preceded by f*.
Hodge dual operator on * vector space *: a k \ right arrow a {n-k}.