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Thom-Sebastiani theorems for filtered D-modules and for multiplier ideals (1610.07295v4)

Published 24 Oct 2016 in math.AG

Abstract: We give a proof of the Thom-Sebastiani type theorem for holonomic filtered $D$-modules satisfying certain good conditions (including Hodge modules) by using algebraic partial microlocalization. By a well-known relation between multiplier ideals and $V$-filtrations of Kashiwara and Malgrange, the argument in the proof implies also a Thom-Sebastiani type theorem for multiplier ideals, which cannot be deduced from a already known proof of the Thom-Sebastiani theorem for mixed Hodge modules (since the latter gives only the information of graded pieces of multiplier ideals). We also sketch a more elementary proof of the Thom-Sebastiani type theorem for multiplier ideals (as communicated to us by M.~Musta\c{t}\v{a}), which seems to be known to specialists, although it does not seem to be stated explicitly in the literature.

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