Main Page

See live article

Alphabetical index
In
mathematics
, an
antichain
in a
partially ordered set
S
is a subset
A
of
S
such that every pair of members of
A
is incomparable, i.e., for any
x
,
y
in
A
, neither
x
≤
y
nor
y
≤
x
.
This article is a stub. You can help Wikipedia by fixing it.