point-set topology In mathematics, general topology is the branch of topology that deals with the basic set-theoretic definitions and constructions used in topology. It is the foundation of most other branches of topology, including differential topology, geomet ...

, the composant of a point ''p'' in a continuum ''A'' is the

union Union commonly refers to: * Trade union, an organization of workers * Union (set theory), in mathematics, a fundamental operation on sets Union may also refer to: Arts and entertainment Music * Union (band), an American rock group ** ''Un ...

of all proper subcontinua of ''A'' that contain ''p''. If a continuum is

indecomposable Indecomposability or indecomposable may refer to any of several subjects in mathematics: * Indecomposable module, in algebra * Indecomposable distribution, in probability * Indecomposable continuum, in topology * Indecomposability (intuitionist ...

, then its composants are

pairwise disjoint In mathematics, two sets are said to be disjoint sets if they have no element in common. Equivalently, two disjoint sets are sets whose intersection is the empty set.. For example, and are ''disjoint sets,'' while and are not disjoint. A ...

. The composants of a continuum are

dense Density (volumetric mass density or specific mass) is the substance's mass per unit of volume. The symbol most often used for density is ''ρ'' (the lower case Greek letter rho), although the Latin letter ''D'' can also be used. Mathematically ...

in that continuum.

References

* * Continuum theory {{topology-stub