Author Archive: raphy

We study a notion of planar sectional curvature for polygonal complexes. These complexes are endowed with a collection of certain planar subcomplexes. The first part of the talk is devoted to a description of these objects. After that, we discuss…
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The subject of amenability essentially begins in 1900’s with Lebesgue. He asked whether the properties of his integral are really fundamental and follow from more familiar integral axioms.  This led to the study of positive, finitely additive and translation invariant…
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In the Euclidean space E of dimension n; an affine invariant point (resp. set) on the class of convex bodies of dimension $n$, endowed with the Hausdorff metric, is a continuous map from this class into  E (resp. into itself…
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Integral formulae on foliated Riemannian manifolds provide obstructions for the existence of foliations satisfying given geometric properties. Here, we shall  present a bit of history of this subject: from Reeb (1950) till Rovenski-Walczak (2012), and  brand new results obtained by…
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Tropicalization involves passing to an ordered group M, usually taken to be (R,+) or (Q,+), and viewed as a semifield. Although there is a rich theory arising from this viewpoint, idempotent semi-rings possess a restricted algebraic structure theory, and also…
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Tuesday April 21 at 2 pm in room 614. Speaker: Daoud Bshouty (Technion) Title: Univalent Harmonic Mappings onto Polygons. Abstract: A sense preserving harmonic mapping as opposed to analytic mapping is a function f=u+iv  from a domain in the complex…
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We shall discuss some recent progress regarding a conjecture of Godbersen on mixed volumes, and other measures of symmetry, including the functional settings. Based of joint work with Keshet Gutman, Dan Florentin and Yaron Ostrover.