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 product involved in the Hadamard factorization theorem for entire functions of finite order
• an infinite product expansion for the Riemann zeta function