mathematical logic;
set theory;
descriptive set theory;
descriptive combinatorics;
HORN;
D O I:
10.3390/math11153349
中图分类号:
O1 [数学];
学科分类号:
0701 ;
070101 ;
摘要:
We study the coarse classification of partial orderings using chain conditions in the context of descriptive combinatorics. We show that (unlike the Borel counterpart of many other combinatorial notions), we have a strict hierarchy of different chain conditions, similar to the classical case.