Definition:Projection


 * Mapping Theory:
 * Projection (Mapping Theory)
 * Quotient Mapping, also known as projection or canonical projection
 * Projection of Set Product


 * Category Theory:
 * Projection (Category Theory)


 * Geometry:
 * Projection of Point onto Line
 * Projection of Point onto Plane
 * Projection of Line onto Plane


 * Analytic Geometry:
 * Projection (Analytic Geometry)


 * Linear Algebra:
 * Projection of Vector onto Vector


 * Functional Analysis:
 * Projection (Hilbert Spaces)
 * Orthogonal Projection
 * Idempotent Operator, to which some sources refer as a projection