Projection (set theory)
From Wikipedia, the free encyclopedia
In set theory, a projection is one of two closely related types of functions or operations, namely:
- Cartesian product – Mathematical set formed from two given sets
- Projection (mathematics) – Mapping equal to its square under mapping composition
- Projection (measure theory)
- Projection (linear algebra) – Idempotent linear transformation from a vector space to itself
- Projection (relational algebra) – Operation that restricts a relation to a specified set of attributes
- Relation (mathematics) – Relationship between two sets, defined by a set of ordered pairs
- ^ Halmos, P. R. (1960), Naive Set Theory, Undergraduate Texts in Mathematics, Springer, p. 32, ISBN 9780387900926 .
- ^ Brown, Arlen; Pearcy, Carl M. (1995), An Introduction to Analysis, Graduate Texts in Mathematics, vol. 154, Springer, p. 8, ISBN 9780387943695.
- ^ Jech, Thomas (2003), Set Theory: The Third Millennium Edition, Springer Monographs in Mathematics, Springer, p. 34, ISBN 9783540440857.