1. zero matrix; null matrixMathematics
Wikipedia definition
2. Zero matrixIn mathematics, particularly linear algebra, a zero matrix or null matrix is a matrix with all its entries being zero. Some examples of zero matrices are The set of m×n matrices with entries in a ring K forms a ring . The zero matrix in is the matrix with all entries equal to, where is the additive identity in K. The zero matrix is the additive identity in .
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