Duality

Duality may refer to:

Mathematics

Philosophy, logic, and psychology

Science

Electrical and mechanical

Duality (CoPs)

In the context of a Community of practice the notion of a duality is used to capture the idea of the tension between two opposing forces which become a driving force for change and creativity. Wenger (Wenger 1998) uses the concept of dualities to examine the forces that create and sustain a Community of Practice. He describes a duality thus: '... a single conceptual unit that is formed by two inseparable and mutually constitutive elements whose inherent tensions and complementarity give the concept richness and dynamism' (Wenger 1998, p. 66).

Some compare the concept of a duality to that of Yin and Yang, i.e. two mutually defining opposites.

The opposing entities in a duality need to be viewed from a perspective of balance rather than opposition. The term implies a dynamism, continual change and mutual adjustment as the tensions that are inherent in dualities can be both creative and constraining. (Wenger 1998) identifies four dualities that exist in Communities of Practice: participation-reification, designed-emergent, identification-negotiability and local-global.

Duality (mechanical engineering)

In mechanical engineering, many terms are associated into pairs called duals. A dual of a relationship is formed by interchanging force (stress) and deformation (strain) in an expression.

Here is a partial list of mechanical dualities:

Examples

Constitutive relation

See also

References

Doctor

Doctor or The Doctor may refer to:

Personal titles

Fictional characters

Film and television

Doctors (TV series)

Doctors is a British medical soap opera which first broadcast in the United Kingdom on BBC One on 26 March 2000. Set in the fictional Midlands town of Letherbridge, defined as being in the city of Birmingham, the soap follows the staff of a doctor's surgery, and their families.

History

Doctors is produced by BBC Birmingham and is screened on BBC One, with the first episode broadcast on 26 March 2000. It was created by Chris Murray, with Mal Young developing it and Carson Black the original producer. The show has been shown at lunchtime since its inception, originally at 12.30pm as a lead-in to the BBC's One O'Clock News. After it was temporarily moved to allow for extended news coverage of the 11 September 2001 attacks, its regular slot changed to 2:10 pm, following directly after Neighbours, after ratings rose to a 25% audience share. When the BBC lost Neighbours to Channel 5 in January 2008, it moved into the Australian soap's old slot of 1:45pm. For a brief trial period in Summer 2000, selected episodes from the first series were shown on Fridays at 7 pm and from 16 February 2009, the show began transmitting in high definition on BBC HD at 4:00pm the same day.

Doctors (series 1)

Series one of the long-running BBC television medical soap opera Doctors first aired on 26 March 2000. The first series ran for 41 episodes. This series concluded on 19 May 2000.

Cast

Main Characters

Crew

Episodes