Hadamard product

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 whose coefficients are the product of the corresponding coefficients of the input series
 * a way of expressing an entire function of finite order
 * an infinite product expansion for the Riemann zeta function