Abstract
The Ruelle Sullivan map for an ℝn-action on a compact metric space with invariant probability measure is a graded homomorphism between the integer Cech cohomology of the space and the exterior algebra of the dual of ℝn. We investigate flows on tori to illuminate that it detects geometrical structure of the system. For actions arising from Delone sets of finite local complexity, the existence of canonical transversals and a formulation in terms of pattern equivariant functions lead to the result that the Ruelle Sullivan map is even a ring homomorphism provided the measure is ergodic.
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Kellendonk, J., Putnam, I. The Ruelle-Sullivan map for actions of ℝn . Math. Ann. 334, 693–711 (2006). https://doi.org/10.1007/s00208-005-0728-1
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DOI: https://doi.org/10.1007/s00208-005-0728-1