Rafael Segovia (1928-2018)

Volker Kaibel and Rafael Mechtel

We introduce revlex-initial 0/1-polytopes as the convex hulls of reverse-lexicographically initial subsets of 0/1-vectors. These polytopes are special knapsack-polytopes. It turns out that they have remarkable extremal properties. In particular, we use these polytopes in order to prove that the minimum numbers gnfac(d, n) of facets and the minimum average degree gavdeg(d, n) of the graph of a d...

Rafael Lorente de No, 1946

CombinaTexas 2018 February 10 – 11 , 2018

In this talk we give combinatorial proofs of q-Stirling identities using restricted growth words. This includes a poset theoretic proof of Carlitz’s identity, a new proof of the q-Frobenius identity of Garsia and Remmel and of Ehrenborg’s Hankel q-Stirling determinantal identity. We also develop a two parameter generalization to unify identities of Mercier and include a symmetric function versi...

Arcetri, 1928 -1932

Early in 1928, a short time after receiving my doctorate at the University of Bologna, I was offered a position of assistant at the Physics Institute of the University of Florence. The Institute rose among olive trees, on the hill of Arcetri, a short distance from the villa where Galileo had spent the last years of his life as a political exile. The chair of physics was held by Professor Antoni...

Aloysio Janner (1928-2016).

Aloysio Janner passed away on 27 January 2016. He was born in 1928 in Muralto, Ticino, the Italian-speaking part of Switzerland. He was awarded his master’s degree with a thesis under Pauli at the ETH Zurich, but during his PhD work Pauli died, so Aloysio finished his PhD with Thellung, at the University of Zurich. Then he went to the Batelle Research Institute in Geneva, where he worked with E...