The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The existence of periodic solutions in Γ-symmetric Newtonian systems x¨=−∇f(x) can be effectively studied by means of the Γ×O(2)-equivariant gradient degree with values in the Euler ring U(Γ×O(2)). In this paper we show that in the case of Γ being a finite group, the Euler ring U(Γ×O(2)) and the related basic degrees are effectively computable using Euler ring homomorphisms, the Burnside ring A(Γ×O(2)),...