Columbia subject headings:
Differential equations, Linear.
Functions, Meromorphic.
Matrices.
Rings (Algebra)
Singularities (Mathematics)
Harvard subject headings:
Differential equations, Linear.
Functions, Meromorphic.
Matrices.
Rings (Algebra)
Singularities (Mathematics)
Princeton subject headings:
Differential equations, Linear.
Functions, Meromorphic.
Matrices.
Rings (Algebra)
Singularities (Mathematics)