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Unusual poles of the $$\zeta$$-functions for some regular singular differential operators. (English) Zbl 1043.58017

##### MSC:
 58J52 Determinants and determinant bundles, analytic torsion 11M41 Other Dirichlet series and zeta functions 34L40 Particular ordinary differential operators (Dirac, one-dimensional Schrödinger, etc.) 81T16 Nonperturbative methods of renormalization applied to problems in quantum field theory 47E05 General theory of ordinary differential operators (should also be assigned at least one other classification number in Section 47-XX)
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