_fragment_3_1(norm_info, n0, tol, m_max=55, ell=2)
This is code fragment (3.1) in Al-Mohy and Higham (2011). The discussion of default values for m_max and ell is given between the definitions of equation (3.11) and the definition of equation (3.12).
Information about norms of certain linear operators of interest.
Number of columns in the _expm_multiply_* B matrix.
Expected to be $2^{-24}$ for single precision or $2^{-53}$ for double precision.
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.
A helper function for the _expm_multiply_* functions.
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