Abstract
We exhibit a particular free subarrangement of a certain restriction of the Weyl arrangement of type $E_7$ and use it to give an affirmative answer to a recent conjecture by T. Abe on the nature of additionally free and stair-free arrangements.
Citation
Torsten Hoge. Gerhard Röhrle. "Some remarks on free arrangements." Tohoku Math. J. (2) 73 (2) 277 - 288, 2021. https://doi.org/10.2748/tmj.20200318
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