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.
An example of trigonometric polynomials with extremally small uniform norm is given. This example shows the extent to which Sidon’s inequality for lacunary polynomials can be generalized in a certain direction.
In the space L2, we study a number of smoothness characteristics of functions; our study is based on the use of the generalized shift operator τh. For the case inwhich τ is the Steklov operator S, we obtain exact constants in Jackson-type inequalities for some classes of 2π-periodic functions. We also calculate the exact values of the n-widths of function classes defined by the smoothness characteristics...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.