Weekly research seminar
Organizers
- prof. dr hab. Witold Marciszewski
- prof. dr hab. Piotr Zakrzewski
Information
Wednesdays, 4:15 p.m. , room: 5050Research fields
List of talks
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Nov. 19, 2014, 4:15 p.m.
Michał Korch (doktorant UW)
joint work with T. Weiss
The ideals of universally null sets (UN, sets which are null with respect to any Borel diffused measure) and perfectly meager sets (PM, sets which are meager when restricted to any perfect set) are best …
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Nov. 5, 2014, 4:15 p.m.
Marcin Szyszkowski (Uniwersytet Gdański)
On axial functions
A function f : X × Y → X × Y is axial if it is of one of two types:f(x, y) = (g(x, y), y) for some g : X × Y → X …
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Oct. 29, 2014, 4:15 p.m.
Rafał Filipów (Uniwersytet Gdański)
Yet another ideal version of the bounding number b
We give a sufficient and necessary condition when the ideal pointwise convergence implies the ideal equal (aka quasi-normal) convergence. The characterization is expressed in terms of a cardinal coefficient related to the bounding number $\mathfrak{b}$. …
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Oct. 22, 2014, 4:15 p.m.
Taras Banakh (Lviv National University and UJK Kielce)
A characterization of Tychonoff spaces with applications to paratopological groups
We prove that a regular topological space $X$ is Tychonoff if and only if its topology is generated by a quasi-uniformity $\U$ such that for every $U\in\U$ and $A\subset X$ there is $V\in\U$ such that …
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Oct. 15, 2014, 4:15 p.m.
Maciej Malicki (SGH)
Abelian pro-countable groups and orbit equivalence relations -part II
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Oct. 8, 2014, 4:15 p.m.
Maciej Malicki (SGH)
Abelian pro-countable groups and orbit equivalence relations
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May 28, 2014, 4:15 p.m.
Wiesław Kubiś (Jan Kochanowski University in Kielce and Mathematical Institute of the Czech Academy of Sciences)
Katetov functors; joint work with Dragan Masulovic (Novi Sad)
We shall describe a natural method for constructing Fraisse limits by iterating a special functor F such that F(X) realizes all possible ``simple" extensions of the model X in a fixed class, usually consisting of …
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May 21, 2014, 4:15 p.m.
Mikołaj Krupski (Doktorant IMPAN)
On a certain ordering on continuous functions
K.P. Hart, T. Kania and T. Kochanek introduced a certain ordering on a space C(K) (of continuous real-valued functions on a compact space) and investigated spaces K for which C(K) does not have uncountable chains …
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May 7, 2014, 4:15 p.m.
Damian Sobota (doktorant UWr)
Countable tightness in the space of regular probability measures
During my lecture I would like to focus on the following problem from the boundary of measure theory and set-theoretical topology. Let K be a compact Hausdorff space. Assume that the space P(K) of all …
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April 23, 2014, 4:15 p.m.
Aleksander Błaszczyk (University of Silesia)
joint results with Wojciech Bielas
Wallman proved that if L is a distributive lattice with 0 and 1, then there is a T 1 -space with a base (for closed subsets) being a homomorphic image of L . We show …
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April 9, 2014, 4:30 p.m.
Grzegorz Plebanek (University of Wroclaw)
Lattices of weakly compact sets in separable Banach spaces
We consider the lattice K(X) of weakly compact sets in a separable Banach space equipped with the relations of `almost inclusion'. The concept originated in the notion od Strongly Weakly Compactly Generated spaces. It turns …
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April 2, 2014, 4:15 p.m.
Maciej Malicki (SGH)
Automorphism groups of homogeneous metric structures and consequences of the existence of ample generics
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March 26, 2014, 4:15 p.m.
Michal Doucha (IMPAN)
Some universal Polish groups and group structures on the Urysohn space - kontynuacja
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March 19, 2014, 4:15 p.m.
Michal Doucha (IMPAN)
Some universal Polish groups and group structures on the Urysohn space
I will present a construction of a metrically universal abelian separable metric group, i.e., every other separable abelian metric group embeds by an isometric monomorphism. This answers the question and extends the results of Shkarin …