In mathematics, especially in set theory, a set A is a subset of a set B, if A is "contained" inside B. The relationship of one set being a subset of another is called inclusion. Every set is a subset of itself.

More formally, If A and B are sets and every element of A is also an element of B, then:

• A is a subset of (or is included in) B, denoted by A ⊆ B,

or equivalently

• B is a superset of (or includes) A, denoted by B ⊇ A.

If A is a subset of B, but A is not equal to B, then A is also a proper (or strict) subset of B. This is written as A ⊂ B. In the same way, B ⊃ A means that B is a proper superset of A. If A is a proper subset of B, then there exists at least one element x of B which is not an element of A.

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@paulklipp I think Agile can be given a broad but precise definition. Scrum or XP being subsets, kanban a developing topic.
Morendil (Laurent Bossavit) Tue, 05 Jan 2010 18:42:49 -0000
@paulklipp I think Agile can be given a broad but precise definition. Scrum or XP being subsets, kanban a developing topic.
Discussing subsets of population requires linguistic identifiers - IOW, "labels" - and any label will be perceived as offensive by someone.
dkmnow (David K. March) Tue, 05 Jan 2010 04:15:49 -0000
Discussing subsets of population requires linguistic identifiers - IOW, "labels" - and any label will be perceived as offensive by someone.
@seaniepants yeah, math subsets 1 and 2.
thezunicorn (Zuhair) Tue, 05 Jan 2010 02:45:08 -0000
@seaniepants yeah, math subsets 1 and 2.
@edsizemore If you're gonna say that moe is stale, at least realize that other subsets of anime are too.
janaiblog (Jon Ingoglia) Mon, 04 Jan 2010 20:49:34 -0000
@edsizemore If you're gonna say that moe is stale, at least realize that other subsets of anime are too.
RT @perlbuzz: Cool things in Perl 6: Subsets http://blogs.perl.org/users/ovid/2010/01/cool-things-in-perl-6.html
walshtp (Tom Walsh) Mon, 04 Jan 2010 19:55:22 -0000
RT @perlbuzz: Cool things in Perl 6: Subsets http://blogs.perl.org/users/ovid/2010/01/cool-things-in-perl-6.html
@TheMikeKelly the UI is a bit on the weird side & not 100% convinced about the end result - but subsets are interesting groups to work with
lexia (Alexia Golez) Mon, 04 Jan 2010 19:33:13 -0000
@TheMikeKelly the UI is a bit on the weird side & not 100% convinced about the end result - but subsets are interesting groups to work with

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