Results 251 to 260 of about 2,878,986 (275)

The Center-Focus Problem for a System with Homogeneous Nonlinearities in the Case of Zero Eigenvalues of the Linear Part

Differential Equations, 2003
The authors consider the center-focus problem for system \[ \dot x=y+X_{2n+1}(x,y),\quad \dot y=Y_{2n+1}(x,y).\tag{1} \] They solve the center-focus problem for system (1) for \(n=3\) using the formal series method and prove the existence of systems (1) for \(n=1,2,3\) with 2, 5 and 9 limit cycles, respectively, in a neighborhood of the origin.
Andreev, A. F., Sadovskij, A. P., Tsikalyuk, V. A.   +2 more
openaire   +2 more sources

Cancer risk among World Trade Center rescue and recovery workers: A review

Ca-A Cancer Journal for Clinicians, 2022
Paolo Boffetta, Charles B Hall, Andrew C Todd   +2 more
exaly  

The center-focus problem of a class of polynomial differential systems with degenerate critical points

International Journal of Nonlinear Sciences and Numerical Simulation, 2009
Wentao Huang, Yirong Liu, Fanglai Zhu
openaire   +1 more source

VARIATIONAL EQUATIONS OF HIGHER ORDER IN THE CENTER-FOCUS PROBLEM

Progress in Analysis, 2003
openaire   +1 more source

The Tangential Center-Focus Problem

2007
openaire   +1 more source

Advancing survivorship care through the National Cancer Survivorship Resource Center

Ca-A Cancer Journal for Clinicians, 2013
Mandi L Pratt-Chapman, Anne Willis, Patricia A Ganz   +2 more
exaly  

Chapter 7 The Tangential Center-Focus Problem

Colin Christopher, Chengzhi Li, Joan Torregrosa   +2 more
openaire   +1 more source

Algebraic nonsolvability and almost algebraic solvability of the centerfocus problem

Functional Analysis and Its Applications, 1973
openaire   +2 more sources

FOCUS: Childhood Cancer; A growing health problem

Ca-A Cancer Journal for Clinicians, 1962
exaly  

The Case For a Children's Cancer Center: The Tumor Board of Children's Orthopedic Hospital and Medical Center

Ca-A Cancer Journal for Clinicians, 1966
exaly