scholarly journals Extremal subspaces in the problem about widths of $H_{\omega}$ classes in the space of continuous functions of two variables

2021 ◽  
pp. 32
Author(s):  
L.B. Khodak
Keyword(s):  
Continuous Functions ◽  
Space Of Continuous Functions ◽  
Functions Of Two Variables

In the paper, we have pointed out the conditions under which the subspaces of dimensionality $n^2$ ($n=2,3,\ldots$), extremal for $H_{\omega}$ classes of continuous functions of two variables, do not exist.

Periodic solutions to functional differential equations

1985 ◽  
Vol 101 (3-4) ◽  
pp. 253-271 ◽  
Author(s):  
O. A. Arino ◽  
T. A. Burton ◽  
J. R. Haddock
Keyword(s):  
Differential Equations ◽  
Functional Differential Equations ◽  
Sufficient Conditions ◽  
Uniform Boundedness ◽  
Continuous Functions ◽  
Ultimate Boundedness ◽  
Space Of Continuous Functions ◽  
Uniform Ultimate Boundedness ◽  
Functional Differential ◽  
Image Position

SynopsisWe consider a system of functional differential equationswhere G: R × B → Rn is T periodic in t and B is a certain phase space of continuous functions that map (−∞, 0[ into Rn. The concepts of B-uniform boundedness and B-uniform ultimate boundedness are introduced, and sufficient conditions are given for the existence of a T-periodic solution to (1.1). Several examples are given to illustrate the main theorem.

scholarly journals Korovkin sets for an operator on a space of continuous functions

1976 ◽  
Vol 65 (2) ◽  
pp. 337-345 ◽  
Author(s):  
Le Baron Ferguson ◽  
Michael D. Rusk
Keyword(s):  
Continuous Functions ◽  
Space Of Continuous Functions
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