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1.
Let K = $
k(\sqrt \theta )
$
k(\sqrt \theta )
be a real cyclic quartic field, k be its quadratic subfield and $
\tilde K = k(\sqrt { - \theta } )
$
\tilde K = k(\sqrt { - \theta } )
be the corresponding imaginary quartic field. Denote the class numbers of K, k and $
\tilde K
$
\tilde K
by h
K
, h
k
and {417-3} respectively. Here congruences modulo powers of 2 for h
− = h
K
/h
K
and $
\tilde h^ - = h_{\tilde K} /h_k
$
\tilde h^ - = h_{\tilde K} /h_k
are obtained via studying the p-adic L-functions of the fields. 相似文献
2.
V. I. Gorbachuk V. M. Gorbachuk 《P-Adic Numbers, Ultrametric Analysis, and Applications》2010,2(2):114-121
Let A be a closed linear operator on a Banach space $
\mathfrak{B}
$
\mathfrak{B}
over the field Ω of complex p-adic numbers having an inverse operator defined on the whole $
\mathfrak{B}
$
\mathfrak{B}
, and f be a locally holomorphic at 0 $
\mathfrak{B}
$
\mathfrak{B}
-valued vector function. The problem of existence and uniqueness of a locally holomorphic at 0 solution of the differential
equation y
(m) − Ay = f is considered in this paper. In particular, it is shown that this problem is solvable under the condition $
\mathop {\lim }\limits_{n \to \infty } \sqrt[n]{{\left\| {A^{ - n} } \right\|}}
$
\mathop {\lim }\limits_{n \to \infty } \sqrt[n]{{\left\| {A^{ - n} } \right\|}}
= 0. It is proved also that if the vector-function f is entire, then there exists a unique entire solution of this equation. Moreover, the necessary and sufficient conditions
for the Cauchy problem for such an equation to be correctly posed in the class of locally holomorphic functions are presented. 相似文献
3.
A. A. Mogul’skiĭ 《Siberian Advances in Mathematics》2010,20(3):191-200
Let X,X(1),X(2),... be independent identically distributed random variables with mean zero and a finite variance. Put S(n) = X(1) + ... + X(n), n = 1, 2,..., and define the Markov stopping time η
y
= inf {n ≥ 1: S(n) ≥ y} of the first crossing a level y ≥ 0 by the random walk S(n), n = 1, 2,.... In the case $
\mathbb{E}
$
\mathbb{E}
|X|3 < ∞, the following relation was obtained in [8]: $
\mathbb{P}\left( {\eta _0 = n} \right) = \frac{1}
{{n\sqrt n }}\left( {R + \nu _n + o\left( 1 \right)} \right)
$
\mathbb{P}\left( {\eta _0 = n} \right) = \frac{1}
{{n\sqrt n }}\left( {R + \nu _n + o\left( 1 \right)} \right)
as n → ∞, where the constant R and the bounded sequence ν
n
were calculated in an explicit form. Moreover, there were obtained necessary and sufficient conditions for the limit existence
$
H\left( y \right): = \mathop {\lim }\limits_{n \to \infty } n^{{3 \mathord{\left/
{\vphantom {3 2}} \right.
\kern-\nulldelimiterspace} 2}} \mathbb{P}\left( {\eta _y = n} \right)
$
H\left( y \right): = \mathop {\lim }\limits_{n \to \infty } n^{{3 \mathord{\left/
{\vphantom {3 2}} \right.
\kern-\nulldelimiterspace} 2}} \mathbb{P}\left( {\eta _y = n} \right)
for every fixed y ≥ 0, and there was found a representation for H(y). The present paper was motivated by the following reason. In [8], the authors unfortunately did not cite papers [1, 5] where
the above-mentioned relations were obtained under weaker restrictions. Namely, it was proved in [5] the existence of the limit
$
\mathop {\lim }\limits_{n \to \infty } n^{{3 \mathord{\left/
{\vphantom {3 2}} \right.
\kern-\nulldelimiterspace} 2}} \mathbb{P}\left( {\eta _y = n} \right)
$
\mathop {\lim }\limits_{n \to \infty } n^{{3 \mathord{\left/
{\vphantom {3 2}} \right.
\kern-\nulldelimiterspace} 2}} \mathbb{P}\left( {\eta _y = n} \right)
for every fixed y ≥ 0 under the condition
$
\mathbb{E}
$
\mathbb{E}
X
2 < ∞ only; In [1], an explicit form of the limit $
\mathop {\lim }\limits_{n \to \infty } n^{{3 \mathord{\left/
{\vphantom {3 2}} \right.
\kern-\nulldelimiterspace} 2}} \mathbb{P}\left( {\eta _0 = n} \right)
$
\mathop {\lim }\limits_{n \to \infty } n^{{3 \mathord{\left/
{\vphantom {3 2}} \right.
\kern-\nulldelimiterspace} 2}} \mathbb{P}\left( {\eta _0 = n} \right)
was found under the same condition
$
\mathbb{E}
$
\mathbb{E}
X
2 < ∞ in the case when the summand X has an arithmetic distribution. In the present paper, we prove that the main assertion in [5] fails and we correct the original proof. It worth noting that
this corrected version was formulated in [8] as a conjecture. 相似文献
4.
This work is a continuation of paper [1], where was considered analog of the problem of the first return for ultrametric diffusion.
The main result of this paper consists in construction and investigation of stochastic quantity $
\tau _{B_r (a)}
$
\tau _{B_r (a)}
(ω), which has meaning of the first passage time into domain B
r
(a) by trajectories of the Markov stochastic process ζ(t, ω).Markov stochastic process is given by distribution density f(x, t), x ∈ ℚ
p
, t ∈ R
+, which is solution of the Cauchy problem
$
\frac{\partial }
{{\partial t}}f(x,t) = - D_x^\alpha f(x,t),f(x,0) = \Omega (\left| x \right|_p ).
$
\frac{\partial }
{{\partial t}}f(x,t) = - D_x^\alpha f(x,t),f(x,0) = \Omega (\left| x \right|_p ).
相似文献
5.
G. A. Kalyabin 《Proceedings of the Steklov Institute of Mathematics》2010,269(1):137-142
Explicit formulas are obtained for the maximum possible values of the derivatives f
(k)(x), x ∈ (−1, 1), k ∈ {0, 1, ..., r − 1}, for functions f that vanish together with their (absolutely continuous) derivatives of order up to ≤ r − 1 at the points ±1 and are such that $
\left\| {f^{\left( r \right)} } \right\|_{L_2 ( - 1,1)} \leqslant 1
$
\left\| {f^{\left( r \right)} } \right\|_{L_2 ( - 1,1)} \leqslant 1
. As a corollary, it is shown that the first eigenvalue λ
1,r
of the operator (−D
2)
r
with these boundary conditions is $
\sqrt 2
$
\sqrt 2
(2r)! (1 + O(1/r)), r → ∞. 相似文献
6.
We consider one-phase (formal) asymptotic solutions in the Kuzmak-Whitham form for the nonlinear Klein-Gordon equation and for the Korteweg-de Vries equation.
In this case, the leading asymptotic expansion term has the form X(S(x, t)/h+Φ(x, t), I(x, t), x, t) +O(h), where h ≪ 1 is a small parameter and the phase S}(x, t) and slowly changing parameters I(x, t) are to be found from the system of “averaged” Whitham equations. We obtain the equations for the phase shift Φ(x, t) by studying the second-order correction to the leading term. The corresponding procedure for finding the phase shift is
then nonuniform with respect to the transition to a linear (and weakly nonlinear) case. Our observation, which essentially
follows from papers by Haberman and collaborators, is that if we incorporate the phase shift Φ into the phase and adjust the
parameter Ĩ by setting $
\tilde S
$
\tilde S
= S +hΦ+O(h
2),Ĩ = I + hI
1 + O(h
2), then the functions $
\tilde S
$
\tilde S
(x, t, h) and Ĩ(x, t, h) become solutions of the Cauchy problem for the same Whitham system but with modified initial conditions. These functions
completely determine the leading asymptotic term, which is X($
\tilde S
$
\tilde S
(x, t, h)/h, Ĩ(x, t, h), x, t) + O(h). 相似文献
7.
V. A. Grebennikov A. V. Razgulin 《Computational Mathematics and Mathematical Physics》2011,51(7):1208-1221
A novel technique is proposed for analyzing the convergence of a projection difference scheme as applied to the initial value problem for a quasilinear parabolic operator-differential equation with initial data u 0 ∈ H. The technique is based on the smoothing property of solutions to the differential problem for t > 0. Under certain conditions on the nonlinear term, a new estimate of order \(O(\sqrt \tau + h)\) for the convergence rate in a weighted energy norm is obtained without using a priori assumptions on the additional smoothness of weak solutions. 相似文献
8.
Stevo Stević 《Siberian Mathematical Journal》2009,50(6):1098-1105
Let $
\mathbb{B}
$
\mathbb{B}
be the unit ball in ℂ
n
and let H($
\mathbb{B}
$
\mathbb{B}
) be the space of all holomorphic functions on $
\mathbb{B}
$
\mathbb{B}
. We introduce the following integral-type operator on H($
\mathbb{B}
$
\mathbb{B}
):
|