By Vladimir Kadets and Wiestaw Źelazko (Eds.)

The convention happened in Lviv, Ukraine and used to be devoted to a recognized Polish mathematician Stefan Banach f{ the main awesome consultant of the Lviv mathematical tuition. Banach areas, brought through Stefan Banach at first of 20th century, are general now to each mathematician. The ebook features a brief historic article and medical contributions of the convention individuals, in most cases within the components of sensible research, normal topology, operator idea and comparable issues.

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For such spaces we have the following result proven in [10], see also [24]. 2. Each monotone tt-space has the weak Skorokhod property. 2 is a weakening of the strong Skorokhod property for uniformly tight weakly convergent sequences of Radon measures. It is clear that the above defined Skorokhod properties have a sequential nature. So we recall some concepts related to sequences and sequentiality. A subset U of a topological space X is called a sequential neighborhood of a point x € X if for each sequence (xn) C X convergent to x there is n £ N such that xm £ U for all m > n (in [25] sequential neighborhoods are called sequential barriers).

D. ,hd) £ (OjTrn^"1) x . . x (OjTrn^ 1 ). ,2-KidnZ1) Cl 1 is Q'L---optimal / r i , . . ,/i . For the class W7"^;"'1 Q^-optimality of q~ was in particular proved in [6]. Theorem 1 can be used for extending results on optimization of one-dimensional quadrature formulae with non-overlapping intervals or fixed nodes to the case of cubature formulae with non-overlapping node parallelepipeds or nodes at a fixed net. One can also use it to obtain optimal cubature formulae for some classes of the form ( Y j , .

Following [2] and [3] we say that a topological space X is an a^-space if for any countable family {£„} of sequences convergent to a point x G X, there is a sequence rj that converges to x and meets infinitely many sequences £ n . 191]). A topological space is strong Frechet if and only if it is a Frechet-Urysohn o^-space. A function / : X —> Y between topological spaces is sequentially continuous if for each convergent sequence (xn) C X the sequence (f(xn)) is convergent and lim/(a; n ) = / ( l i m x n ) .