Some remarks on free arrangements
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math.GR
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freearrangementsadditionallyaffirmativeanswerarrangementcertainconjecture
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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.
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