ABAQUS Volume II: I–Z - Manual (Page 142)

*MATRIX INPUT
4. Degree of freedom number for column node.
5. Matrix entry.
Give data to define a symmetric matrix in lower triangular, upper triangular, or square format. For
a square matrix to be symmetric, corresponding entries above and below the diagonal must have
exactly the same values.
Repeat this data line as often as necessary.
13.8–2
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