منابع مشابه
On Pólya’s Orchard Problem
In 1918 Pólya formulated the following problem: “How thick must the trunks of the trees in a regularly spaced circular orchard grow if they are to block completely the view from the center?”(Pólya and Szegő [2]). We study a more general orchard model, namely any domain that is compact and convex, and find an expression for the minimal radius of the trees. As examples, solutions for rhombus-shap...
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where EA and EB are the expected outcomes for players A and B, and RA and RB are their ratings. Here we designate a win by 1, a loss by 0, and a draw by 0.5. The spread of the ratings is set by Λ, which for chess ratings is usually taken to be Λ = 400/ log(10) = 173.72. The result of each game updates each player’s rating according to an update rule. The update rule is usually based on the diff...
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ژورنال
عنوان ژورنال: Monthly Weather Review
سال: 1911
ISSN: 0027-0644,1520-0493
DOI: 10.1175/1520-0493(1911)39<761:ob>2.0.co;2