In mathematics, the Hadamard product may refer to:
*
Hadamard product of two matrices, the matrix such that each entry is the product of the corresponding entries of the input matrices
*
Hadamard product of two power series, the
power series
In mathematics, a power series (in one variable) is an infinite series of the form
\sum_^\infty a_n \left(x - c\right)^n = a_0 + a_1 (x - c) + a_2 (x - c)^2 + \dots
where ''an'' represents the coefficient of the ''n''th term and ''c'' is a const ...
whose coefficients are the product of the corresponding coefficients of the input series
* a product involved in the
Hadamard factorization theorem for
entire functions of finite order
* an
infinite product expansion for the Riemann zeta function
{{mathematical disambiguation