共查询到20条相似文献,搜索用时 15 毫秒
1.
Enzo Maria Li Marzi 《Rendiconti del Circolo Matematico di Palermo》1992,41(3):466-478
We consider, on the euclidean planeE 2, a lattice of fundamental regions that are regular polygons, triangles or parallelograms. We determin the probabilityp in order that a vertex of the latticeR belongs to a circle of the random center and any radius. 相似文献
2.
Carlo Miranda 《Annali di Matematica Pura ed Applicata》1958,46(1):265-311
Sunto Come nella prefazione.
I risultati principali di questa memoria sono stati comunicati all' Accademia Nazionale dei Lincei nella tornata dell'8 Febbraio
1958. 相似文献
3.
4.
Giuseppe Pulvirenti 《Annali di Matematica Pura ed Applicata》1961,56(1):281-300
Sunto Si stabilisce un teorema di esistenza per equazioni differenziali in uno spazio diBanach sotto ipotesi diCarathéodory. Viene studiata la struttura del pennello delle soluzioni pervenendo a teoremi che estendono quelli, noti nel caso degli
spazi euclidei, diH. Kneser eM. Hukuhara.
L'A. fa parte del 6° gruppo di ricerca del C. N. R.. 相似文献
Summary An existence theorem for differential equations in aBanach space is proved under hypothesis ofCarathéodory type. The set of solutions issued from a given point is studied and results analogous to those valid in case of a euclidean space, byH. Kneser andM. Hukuhara, are obtained.
L'A. fa parte del 6° gruppo di ricerca del C. N. R.. 相似文献
5.
A simple new proof is given for a theorem of L. V. Kuz'min (Ref. Zh. Mat., 1972, 10A239) on the structure of the group of universal norms in -extensions, using his theory of Tate modules.Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova AN SSSR, Vol. 71, pp. 251–255, 1977. 相似文献
6.
Carlo Pucci 《Annali di Matematica Pura ed Applicata》1954,36(1):1-25
Sunto Si considerano successioni di funzioni reali di più variabili reali e si determina in quali ipotesi esistono successioni,
subordinate alle date, convergenti a funzioni derivabili o continue; ciò anche nel caso che le funzioni considerate siano
definite in insiemi diversi e non siano continue.
Lavoro eseguito nell'Istituto Nazionale per le Applicazioni del Calcolo. 相似文献
7.
8.
9.
In many applied disciplines like computer science, coding theory and formal languages, the use of fuzzified algebraic structures especially ordered semigroups play a remarkable role. In this paper, we introduce a new concept of fuzzy Γ-ideal of an ordered Γ-semigroup G called an (∈, ∈ ?q k )-fuzzy Γ-ideal of G. Fuzzy Γ-ideal of type (∈, ∈ ∨q k ) are the generalization of ordinary fuzzy Γ-ideals of an ordered Γ-semigroup G. A new characterization of ordered Γ-semigroups in terms of an (∈, ∈ ∨q k )-fuzzy Γ-ideal is given. We show that a fuzzy subset λ of an ordered Γ-semigroup G is an (∈, ∈ ∨q k )-fuzzy Γ-ideal of G if and only if U (λ; t) is a Γ-ideal of G for all \(t \in \left( {0,\frac{{1 - k}} {2}} \right]\) . We also investigate some important characterization theorems in terms of this notion. Finally, regular ordered Γ-semigroups are characterized by the properties of their (∈, ∈ ∨q k )-fuzzy Γ-ideals. 相似文献
10.
Emilio Clauser 《Annali di Matematica Pura ed Applicata》1961,56(1):47-67
Sunto Si completa una ricerca diInfeld eSchild, nella quale la legge di moto di una particella di prova, rappresentata da una singolarità, viene dedotta dalle equazioni
della teoria gravitazionale einsteiniana di puro campo, e risulta una geodetica dello spazio-tempo riemanniano incurvato da
altri corpi. Si dimostra precisamente che la legge della geodetica costituisce una condizione di integrabilità non soltanto
necessaria, come consegue dalla ricerca precedente, ma anche sufficiente affinchè le equazioni (non tensoriali) che caratterizzano
il comportamento di una particella di prova in un riferimento solidale con la particella stessa, siano integrabili in ogni
istante, in un intorno della posizione istantanea della particella. 相似文献
11.
In this paper, we focus on combining the theories of fuzzy soft sets with Γ-modules, and establishing a new framework for fuzzy soft Γ-submodules. The main contributions of the paper are 3-fold. First, we present the concepts of (R, S)-bi-Γ-submodules, quasi-Γ-submodules and regular Γ-modules. Meanwhile, some illustrative examples are given to show the rationality of the definitions introduced in this paper. Second, several new kinds of generalized fuzzy soft Γ-submodules are proposed, and related properties and mutual relationships are also investigated. Third, we discover some intrinsic connections between the generalized fuzzy soft Γ-submodules presented in this paper and crisp Γ-submodules, and describe the relationships between regular Γ-modules and the generalized fuzzy soft Γ-submodules presented in this paper. 相似文献
12.
13.
14.
15.
16.
17.
18.
Hoang Xuan Phu 《Numerical Functional Analysis & Optimization》2013,34(7-8):835-854
A subset S of some vector space X is said to be outer Γ-convex w.r.t. some given balanced subset Γ ? X if for all x 0, x 1 ? S there exists a closed subset Λ ? [0,1] such that {x λ | λ ? Λ} ? S and [x 0, x 1] ? {x λ | λ ? Λ} + 0.5 Γ, where x λ: = (1 ? λ)x 0 + λ x 1. A real-valued function f:D → ? defined on some convex D ? X is called outer Γ-convex if for all x 0, x 1 ? D there exists a closed subset Λ ? [0,1] such that [x 0, x 1] ? {x λ | λ ? Λ} + 0.5 Γ and f(x λ) ≤ (1 ? λ)f(x 0) + λ f(x 1) holds for all λ ? Λ. Outer Γ-convex functions possess some similar optimization properties as these of convex functions, e.g., lower level sets of outer Γ-convex functions are outer Γ-convex and Γ-local minimizers are global minimizers. Some properties of outer Γ-convex sets and functions are presented, among others a simplex property of outer Γ-convex sets, which is applied for establishing a separation theorem and for proving the existence of modified subgradients of outer Γ-convex functions. 相似文献
19.