Zariski's multiplicity conjecture

Let f,g ⁣:(Cn,0)(C,0)f,g\colon(\mathbb{C}^n,0)\to(\mathbb{C},0) be reduced holomorphic function-germs, and let V(f)V(f) and V(g)V(g) denote their zero-set germs at the origin. Suppose there is a homeomorphism φ ⁣:(Cn,V(f),0)(Cn,V(g),0)\varphi\colon(\mathbb{C}^n,V(f),0)\to(\mathbb{C}^n,V(g),0). Zariski's multiplicity conjecture. Then

m(V(f),0)=m(V(g),0).m(V(f),0)=m(V(g),0).

This conjecture remains open even for germs with isolated singularities, although the corresponding result for families with isolated singularities was confirmed by Fernández de Bobadilla and Pełka.

Sources & referencesView supporting material

Primary source

José Edson Sampaio, “On the Milnor fibres of initial forms of topologically equivalent holomorphic functions”, arXiv:2503.17127 (2025).

Additional references

7 papers in this index state this conjecture (2015–2025). The statement above is taken from the most recent of them; the others are arXiv:2407.09306, arXiv:2108.01179, arXiv:2103.00525, arXiv:1902.05139, arXiv:1807.06309, arXiv:1506.07996.

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