40.4 Zero and One for Matrix Algebras

Zero( A ) :

returns the square zero matrix of the same dimension and characteristic as the elements of A. This matrix is thought only for testing whether a matrix is zero, usually all its rows will be identical in order to save space. So you should not use this zero matrix for other purposes; use NullMat NullMat instead.

One( A ) :

returns for a unital matrix algebra A the identity matrix of the same dimension and characteristic as the elements of A; for a not unital matrix algebra A the (left and right) multiplicative neutral element (if exists) is computed by solving a linear equation system.

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