Miriam Farber

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a r t i c l e i n f o a b s t r a c t A matrix is called totally positive if every minor of it is positive. Such matrices are well studied and have numerous applications in Mathematics and Computer Science. We study how many times the value of a minor can repeat in a totally positive matrix and show interesting connections with incidence problems in(More)
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Abstract. We consider the set of Hermitian matrices corresponding to a given(More)
Understanding the positive Grassmannian has been a highly significant question in mathematics for several decades. We discuss arrangements of equal minors in the totally positive Grassmannian. It was previously shown that arrangements of equals minors of largest value correspond to the simplices in Sturmfels triangulation. Here we discuss arrangements of(More)
We consider the response matrices in certain weighted networks that display a circular symmetry. It had been observed empirically that these exhibit several paired (multiplicity two) eigenvalues. Here, this pairing is explained analytically for a version of the model more general than the original. The exact number of necessarily paired eigenvalues is given(More)