_condition_3_13(A_1_norm, n0, m_max, ell)
This is condition (3.13) in Al-Mohy and Higham (2011).
The precomputed 1-norm of A.
Number of columns in the _expm_multiply_* B matrix.
A value related to a bound.
The number of columns used in the 1-norm approximation. This is usually taken to be small, maybe between 1 and 5.
Indicates whether or not the condition has been met.
A helper function for the _expm_multiply_* functions.
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