Fukui–Kurdyka–Paunescu conjecture on real analytic multiplicity modulo 2

Let X,YRnX,Y\subset\mathbb{R}^n be two germs at the origin of irreducible real analytic subsets. Let h ⁣:(Rn,0)(Rn,0)h\colon(\mathbb{R}^n,0)\to(\mathbb{R}^n,0) be a germ of a subanalytic, arc-analytic and bi-Lipschitz homeomorphism such that h(X)=Yh(X)=Y. Fukui–Kurdyka–Paunescu's conjecture. Then

m(X,0)m(Y,0)(mod2).m(X,0)\equiv m(Y,0)\pmod{2}.

The conjecture concerns invariance of real analytic multiplicity modulo 22 under subanalytic arc-analytic bi-Lipschitz equivalence. The paper states that it gives a complete positive answer, so the conjecture is solved; earlier results covered curves, hypersurfaces, and additional special cases.

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Primary source

Alexandre Fernandes, Zbigniew Jelonek and José Edson Sampaio, “On the Fukui-Kurdyka-Paunescu Conjecture”, arXiv:2108.01179 (2021).

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