Download Algebraic Combinatorics and Computer Science: A Tribute to by H. Crapo (auth.), H. Crapo, D. Senato (eds.) PDF

By H. Crapo (auth.), H. Crapo, D. Senato (eds.)

This e-book, devoted to the reminiscence of Gian-Carlo Rota, is the results of a collaborative attempt through his acquaintances, scholars and admirers. Rota was once one of many nice thinkers of our instances, innovator in either arithmetic and phenomenology. i believe moved, but touched by way of a feeling of disappointment, in proposing this quantity of labor, regardless of the terror that i'll be unworthy of the duty that befalls me. Rota, either the scientist and the fellow, was once marked by way of a generosity that knew no bounds. His rules opened broad the horizons of fields of study, allowing an impressive variety of scholars from everywhere in the globe to turn into enthusiastically concerned. The contagious strength with which he tested his super psychological potential continuously proved clean and encouraging. past his renown as proficient scientist, what used to be relatively extraordinary in Gian-Carlo Rota used to be his skill to understand the varied highbrow capacities of these sooner than him and to evolve his communications as a result. This human experience, complemented by means of his acute appreciation of the significance of the person, acted as a catalyst in bringing forth some of the best in every one of his scholars. Whosoever used to be lucky adequate to take pleasure in Gian-Carlo Rota's longstanding friendship was once so much enriched through the adventure, either mathematically and philosophically, and had get together to understand son cote de bon vivant. The e-book opens with a heartfelt piece via Henry Crapo during which he meticulously items jointly what Gian-Carlo Rota's premature death has bequeathed to science.

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One often hears the sentence, "Hilbert killed invariant theory", repeated as an excuse to ignore all that went on in invariant theory after Hilbert. I don't know who made up this infamous sentence. It is not true. Hilbert loved invariant theory, and he went on publishing striking papers in invariant theory well after he proved the theorem that is nowadays called the Hilbert basis theorem, the theorem that is supposed to have killed invariant theory. Some of the most fascinating results in invariant theory were discovered in the first twenty years of this century, a long time after Hilbert proved his basis theorem.

We have the Main Theorem of Geometric Probability. The n + I intrinsic volumes fLO, fL 1 , ... ,fLn are a basis of the space of all continuous invariant measures defined on all finite unions of compact convex sets. The first proof of this theorem is due to Hadwiger; the first elementary proof was published last year by Dan Klain of Georgia Tech. In closing, let me try to answer the question you are about to ask: what has this got to do with geometric probability, anyway? I will attempt a sketchy answer.

But instead of working with a rectangle we could have worked with any planar figure C whatsoever, placed in an arbitrary position in space. The measure of the set of lines meeting C equals the area fl2(C), by the same reasoning. We stress the assumption that C must lie in a plane. To conclude: even without knowing the formula for the invariant measure A we can nevertheless compute the value of such a measure on certain sets of lines. Let us now take a more sophisticated set of straight lines. We take a set D in three-space that is the union of disjoint sets CI, C2, ...

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