The Poincaré Index on Singular Varieties

Alexander G. Aleksandrov ()
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Alexander G. Aleksandrov: Institute of Control Sciences, Russian Academy of Sciences, Moscow 117997, Russia

J, 2022, vol. 5, issue 3, 1-22

Abstract: In this paper, we discuss a few simple methods for computing the local topological index and its various analogs for vector fields and differential forms given on complex varieties with singularities of different types. They are based on properties of regular meromorphic and logarithmic differential forms, of the dualizing (canonical) module and related constructions. In particular, we show how to compute the index on Cohen–Macaulay, Gorenstein and monomial curves, on normal and non-normal surfaces and some others. In contrast with known traditional approaches, we use neither computers, nor integration, perturbations, deformations, resolution of singularities, spectral sequences or other related standard tools of pure mathematics.

Keywords: homological index; logarithmic index; regular meromorphic index; Cohen-Macaulay curves; monomial varieties; non-normal surfaces (search for similar items in EconPapers)
JEL-codes: I1 I10 I12 I13 I14 I18 I19 (search for similar items in EconPapers)
Date: 2022
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