Previous talks this semester:
21.03.2023, Tuesday 10.15, room 403
Krzysztof Zakrzewski (MIMUW)
Title: An elementary proof of the EberleinSmulian theorem. Continuation.
Abstract: "We will give a brief proof of the EberleinSmulian theorem
which says that for a subset of a Banach space endowed with the weak topology
three conditions are equivalent, namely: conditional compactness,
conditional sequential compactness and conditional countable
compactness. The proof will use standard results from theory of Banach
spaces, namely Alaoglu's theorem and the HahnBanach theorem.
The talk is based on the article "An Elementary Proof of
EberleinSmulian Theorem" by Robert Whitley (Math. Ann. 1967)"
14.03.2023, Tuesday 10.15, room 403
Krzysztof Zakrzewski (MIMUW)
Title: An elementary proof of the EberleinSmulian theorem.
Abstract: "We will give a brief proof of the EberleinSmulian theorem
which says that for a subset of a Banach space endowed with the weak topology
three conditions are equivalent, namely: conditional compactness,
conditional sequential compactness and conditional countable
compactness. The proof will use standard results from theory of Banach
spaces, namely Alaoglu's theorem and the HahnBanach theorem.
The talk is based on the article "An Elementary Proof of
EberleinSmulian Theorem" by Robert Whitley (Math. Ann. 1967)"
7.03.2023, Tuesday 10.15, room 403
Piotr Koszmider (IMPAN)
Title: Steppingup with an Aronszajn tree and adding a Cohen real.
Abstract: "We will discuss classical techniques involving almost coherent families of injections
from countable ordinals into ω and involving adding a Cohen real. Applications will include:
The existence of a strong Luzin set implies the existence of a coloring of pairs of ω_{1}
with very strong multidimensional antiramsey properties; adding one Cohen real to any model produces a Suslin tree
and produces an entangled set of reals etc."
Talks in the second semester of 202223.
Talks in the second semester of 202122.
Talks in the first semester of 202122.
Talks in the second semester of 202021.
Talks in the first semester of 202021.
Talks in the second semester of 201920.
Talks in the first semester of 201920.
Talks in the second semester of 201819.
Talks in the first semester of 201819.
Talks in the second semester of 201718.
Talks in the first semester of 201718.
Talks in the second semester of 201617.
Talks in the first semester of 201617.
Talks in the second semester of 201516.
Talks in the first semester of 201516.
Talks in the second semester of 201415.
Talks in the first semester of 201415.
Talks in the second semester of 201314.
Talks in the first semester of 201314.
Talks in the second semester of 201213.
Talks in the first semester of 201213.
Talks in the second semester of 201112.
Talks in the first semester of 201112.
