Piotr Borodulin-Nadzieja

Piotr Borodulin-Nadzieja: Mathias forcings for slaloms

Tuesday, March 8, 2016 17:15

Room: D1-215

Speaker:
Piotr Borodulin-Nadzieja

Title: Mathias forcings for slaloms

Abstract. We will show an example of a Boolean algebra which is not sigma-centered but sigma-n-linked. Moreover, it has property (*) of Fremlin. Such examples were known before. We will construct our algebra using Mathias forcing for something resembling the density filter.

Piotr Borodulin-Nadzieja: Analytic P-ideals and Banach spaces

Tuesday, November 4, 2014 17:15

Room: D1-215

Speaker:
Piotr Borodulin-Nadzieja

Title: Analytic P-ideals and Banach spaces

Abstract. We consider certain generalization of the notion of summability of an ideal (on the natural numbers) which connects theory of analytic P-ideals with the theory of Banach spaces.