0,2

An antichain on a set is a T_0-antichain if for every two distinct pointsf the set there exists a member of the antichain containing one but not the other point.

Cf. A001206, A051185, A059083.

Sequence in context: A067068 A032334 A032082 this_sequence A075806 A050923 A067700

Adjacent sequences: A088892 A088893 A088894 this_sequence A088896 A088897 A088898

hard,nonn

Goran Kilibarda, Vladeta Jovovic (vladeta(AT)eunet.rs), Nov 28 2003