Duality is the property or double character, of what is dual, or which contains in itself two natures, two substances or two principles. Duality also has meanings in physics, mathematics and philosophy.
wave-particle duality
In physics, there is the wave-particle duality, also called the wave-body duality or matter-energy duality. The wave-particle duality is a physical property with atomic dimensions, which is the property of physical entities having both particles and waves.
Duality in Mathematics
Duality is also present in linear programming, a subject of operational research, in the area of mathematics. In linear programming, duality means the existence of another LP problem, associated with each LP problem, which is called dual problem (D). In this relationship with the dual problem, the original problem is called the primal problem (P).
Dualism
Dualism is a religious or philosophical system that admits the coexistence of two eternal, necessary and opposite principles. Doctrine that in any order of ideas admits two irreducible principles.
