Strict separation of recursively, divisionally and multiplicatively free arrangements

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Let RF∗\mathcal{RF}^* denote the class of recursively free arrangements satisfying the additional condition denoted by a star in the source, let DF\mathcal{DF} denote the class of divisionally free arrangements, and let MF\mathcal{MF} denote the class of multiplicatively free arrangements. Based on examples, the recursively free arrangement conjecture.

RF∗⊊DF,RF⊊MF.\mathcal{RF}^*\subsetneq\mathcal{DF},\qquad \mathcal{RF}\subsetneq\mathcal{MF}.

These strict inclusions assert that the indicated classes are properly distinct. The source presents both inclusions as conjectural; the notation RF∗\mathcal{RF}^* and the precise definition of the starred class should be checked against the paper.

References

Primary source

Takuro Abe, “Divisionally free arrangements of hyperplanes”, arXiv:1502.07520 (2017).

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