Torsten Hoge, Gerhard Roehrle
Published 2019-03-02Version 1
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.
Comments: 11 p. arXiv admin note: text overlap with arXiv:1510.00213
On $A_1^2$ restrictions of Weyl arrangements
Eulerian polynomials for subarrangements of Weyl arrangements
Signed graphs and the freeness of the Weyl subarrangements of type $B_{\ell}$
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