Free perverse algebra conjecture for perverse Eilenberg–MacLane spaces
Free perverse algebra conjecture for perverse Eilenberg–MacLane spaces
Let , let be a Goresky–MacPherson perversity, and let be the differential degree of a generator . Write for the perverse cohomology algebra. Free perverse algebra conjecture. The following isomorphisms of perverse algebras should hold:
where is the free rational commutative graded perverse algebra on one generator of differential degree and perverse degree , and
where is the free unstable perverse algebra on one generator of differential degree and perverse degree . These formulas would identify the perverse cohomology algebras with the free algebras generated by the fundamental class, extending the classical rational and mod- calculations; the statement is presented conditionally in the source and remains open here.
Sources & referencesView supporting material
Primary source
David Chataur and Daniel Tanré, “Natural operations in Intersection Cohomology”, arXiv:2005.04960 (2025).
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