Definition:Section


 * Set Theory
 * Upper Section
 * Lower Section


 * Analysis, geometry, number theory and so on:
 * The Golden Section: $\dfrac {1 + \sqrt 5} 2$


 * Real Analysis:
 * Dedekind Section or Dedekind Cut


 * Geometry:
 * Section:
 * Line section: the intersection of one line with another.
 * Plane section: the intersection of a 3-dimensional figure $F$ with a plane.
 * Cross-Section: a plane section which is perpendicular to an axis of $F$.


 * Topology:
 * Section (Topology)
 * Definition:Section of Presheaf
 * Definition:Global Section of Presheaf

Also see

 * Definition:Bisection
 * Definition:Cross-Section
 * Definition:Sector