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Question: Direct sum of matrices

Question:Direct sum of matrices

John Fredsted 2243
January 10 2014
0

Perhaps I am being blind, but I cannot locate a function for performing the direct sum of two (or more, for that matter) matrices, i.e., constructing a new matrix with the two (or more) matrices arranged block-diagonally.

Such a function should, I guess, naturally accompany the function KroneckerProduct in the LinearAlgebra package, because direct products (Kronecker products) of representations (i.e., matrrix-valued realizations of some abstract algebra) are, as is well-known, generally reducible into a direct sum of irreducible subrepresentations.
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