Allowed matrix types

Allowed matrix types. These are mainly square matrices


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Symmetric. Elements are zero except on the diagonal
Square. Elements are zero below the diagonal 

1 2 3 4

0 3 5 6

0 0 4 8

0 0 0 2
Symmetric. Elements are zero except on the diagonal
User-defined matrix-type
This definition must be by reference to a namespaced dictionary entry.