Matrices
Matrices[{d1, d2}] represents the domain of matrices of dimensions d1×d2.
Matrices[{d1, d2}, dom]represents the domain of matrices of dimensions d1×d2, with components in the domain dom.Matrices[{d1, d2}, dom, sym]represents the subdomain of matrices d1×d2 with symmetry sym.
Examples
Matrices[{3, 3}, Reals]Please visit the official Wolfram Language Reference for more details.