Arnold's conjecture for non-degenerate Hamiltonians

Let (M,ω)(M,\omega) be a compact symplectic manifold and let φHam(M,ω)\varphi\in \mathrm{Ham}(M,\omega) have non-degenerate fixed points. Write Fix(φ)\mathrm{Fix}(\varphi) for its fixed-point set and Hi(M,Q)H^i(M,\mathbb{Q}) for singular cohomology.

Arnold's conjecture for non-degenerate Hamiltonians.

#Fix(φ)i=0dimMdimHi(M,Q).\#\mathrm{Fix}(\varphi)\geq \sum_{i=0}^{\dim M}\dim H^i(M,\mathbb{Q}).

This is the cohomological lower-bound form of Arnold's fixed-point conjecture and is a central motivation for Hamiltonian Floer cohomology. The supplied text gives no resolution status.

Sources & referencesView supporting material

Primary source

Denis Auroux, “Lagrangian Floer theory, from geometry to algebra and back again”, arXiv:2510.22476 (2025).

Additional references

3 papers in this index state this conjecture (2016–2025). The statement above is taken from the most recent of them; the others are arXiv:1709.00297, arXiv:1612.01009.

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