Zariski's multiplicity conjecture

About 11 years old · traced to

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.

References

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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