نتایج جستجو برای: q
تعداد نتایج: 122288 فیلتر نتایج به سال:
The q-Dobinski formula may be interpreted as the average of powers of random variable X q with the q-Poisson distribution. Forty years ago Rota G. C. [1] proved the exponential generating function for Bell numbers B n to be of the form ∞ n=0 x n n! (B n) = exp(e x − 1) (1) using the linear functional L such that L(X n) = 1, n ≥ 0 (2) Then Bell numbers (see: formula (4) in [1]) are defined by L(...
Suppose G is a group of order p^2q^2 where p>q are prime numbers and suppose P and Q are Sylow p-subgroups and Sylow q-subgroups of G, respectively. In this paper, we show that up to isomorphism, there are four groups of order p^2q^2 when Q and P are cyclic, three groups when Q is a cyclic and P is an elementary ablian group, p^2+3p/2+7 groups when Q is an elementary ablian group an...
lexicographic ordering by spectral moments ($s$-order) among all trees is discussed in this paper. for two given positive integers $p$ and $q$ with $pleqslant q$, we denote $mathscr{t}_n^{p, q}={t: t$ is a tree of order $n$ with a $(p, q)$-bipartition}. furthermore, the last four trees, in the $s$-order, among $mathscr{t}_n^{p, q},(4leqslant pleqslant q)$ are characterized.
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