منابع مشابه
Practically Perfect
We prove that perfect distributions exist when using a finite number of bits to represent the parameters of a Bayesian network. In addition, we provide an upper bound on the probability of sampling a non-perfect distribution when using a fixed number of bits for the parameters and that the upper bound approaches zero exponentially fast as one increases the number of bits. We also provide an upp...
متن کاملObservations on practically perfect CSCW
Technical systems are so powerful that there is a temptation to try to provide ‘perfect’ support for any cooperative work practice. Some CSCW problems result from designs motivated by optimising technical criteria. A very high bandwidth network, for instance, can support a wide variety of work patterns; the consequent focus of solving the salient technical problems gives the impression that CSC...
متن کامل"Practically perfect pitch": some comments.
If instead of elliptical cones, right circular cones are employed, then • • 8 and only the expression for B is changed. In particular for a fixed 8, this causes the 1R. A. Rasmussen and N. E. Head, "Characteristics of High Frequency Sea Reverberation and Their Application to Turbulence Measurement," J. Acoust. Sec. Am. 59, 55-61 (1976). 2E. J. Sullivan and K. A. Kemp, "The Significance'of Beam ...
متن کاملFibonacci Numbers and the Numbers of Perfect Matchings of Square, Pentagonal, and Hexagonal Chains*
Let G be a finite graph. A perfect matching in G is a selection of edges in G such that each vertex of G belongs to exactly one selected edge. Therefore, if the number of vertices in G is odd, then there is no perfect matching. We denote by K(G) the number of perfect matchings of £, and refer to it as the K number of G. By a polygonal chain Py, s we mean a finite graph obtained by concatenating...
متن کاملA Pentagonal Number Sieve
We prove a general pentagonal sieve theorem that has corollaries such as the following First the number of pairs of partitions of n that have no parts in common is p n p n p n p n p n Second if two unlabeled rooted forests of the same number of vertices are chosen i u a r then the probability that they have no common tree is Third if f g are two monic polynomials of the same degree over the eld...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature Chemistry
سال: 2009
ISSN: 1755-4330,1755-4349
DOI: 10.1038/nchem.160