Duality
The word duality or dual refers to the concept of pairs, groupings of two. The word has a variety of different meanings in different contexts:
- In physics, this refers to the case when two different models actually turn out to be equivalent. See duality (physics), wave-particle duality.
- In mathematics, see duality (mathematics).
- In Analytical Psychology, duality is an archetype, that is to say, one of the deep powerful symbols of the functioning of the psyche.
- In Alchemy, duality refers to a dynamic principle of opposing or complementary elements or spirits.
- Duality is an album of Lisa Gerrard and Pieter Bourke.
- In some languages, in addition to the singular and plural there is also a dual case, which is used when exactly two people or things are meant. This is known as the dual grammatical number.
- Dual is a brand name for Hifi equipment, mostly known for vinyl record players.
- Dual in electronics refers to two devices or circuits that have mathematical descriptions that are identical except that voltages in one correspond to currents in the other, and vice versa.
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