منابع مشابه
An Upper Bound in Goldbach's Problem
It is clear that the number of distinct representations of a number n as the sum of two primes is at most the number of primes in the interval [n/2, n-2]. We show that 210 is the largest value of n for which this upper bound is attained.
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In this paper we give sharp upper bounds on the Zagreb indices and characterize all trees achieving equality in these bounds. Also, we give lower bound on first Zagreb coindex of trees.
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In this research, flat rolling process of bonded sandwich sheets is investigated by the method of upper bound. A kinematically admissible velocity field is developed for a single layer sheet and is extended into the rolling of the symmetrical sandwich sheets. The internal, shear and frictional power terms are derived and they are used in the upper bound model. Through the analysis, the rolling ...
متن کاملAn Upper Bound for the Permanent versus Determinant Problem
The Permanent versus Determinant problem is the following: Given an n × n matrix X of indeterminates over a field of characteristic different from two, find the smallest matrix M whose coefficients are linear functions in the indeterminates such that the permanent of X equals the determinant of M. We prove that the dimensions of M are at most 2n − 1. The determinant and the permanent of an (n ×...
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ژورنال
عنوان ژورنال: Mathematics of Computation
سال: 1993
ISSN: 0025-5718
DOI: 10.1090/s0025-5718-1993-1202609-9