نتایج جستجو برای: graver bases

تعداد نتایج: 67201  

Journal: :ACM Transactions on Database Systems 2001

Journal: :Ars Mathematica Contemporanea 2013

Journal: :Inventiones mathematicae 2014

Journal: :Proceedings of the National Academy of Sciences 1960

Journal: :Proceedings of the American Mathematical Society 1958

Journal: :Topology and its Applications 2005

Journal: :Logical Methods in Computer Science 2013

Journal: :ACM SIGSAM Bulletin 1997

Journal: :Pacific Journal of Mathematics 1977

Journal: :Archive for Mathematical Logic 2021

We study the definability of ultrafilter bases on $$\omega $$ in sense descriptive set theory. As a main result we show that there is no coanalytic base for Ramsey ultrafilter, while L can construct $$\Pi ^1_1$$ P-point and Q-point bases. also existence $${\varvec{\Delta }}^1_{n+1}$$ equivalent to $${\varvec{\Pi }}^1_n$$ base, $$n \in \omega . Moreover introduce Borel version classical number m...

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