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A strictly lower triangular matrix is a kind of (lower) triangular matrix.
Term "lower" implies matrix has elements only in the lower half. The condition "strictly" implies that even the "diagonal" of such lower triangular matrix is populated with '0's. The strictly lower triangular matrix thus has '0's in its diagonal as well as the upper triangle part.
In other words, a strictly lower triangular matrix is a lower triangular matrix minus its diagonal.
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