duality principle(redirected from Duality (projective geometry))
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duality principle[dü′al·əd·ē ‚prin·sə·pəl]
Also known as principle of duality.
The principle that for any theorem in electrical circuit analysis there is a dual theorem in which one replaces quantities with dual quantities; current and voltage, impedance and admittance, and meshes and nodes are examples of dual quantities.
The principle that analogies may be drawn between a transistor circuit and the corresponding vacuum tube circuit.
The principle that one can obtain new solutions of Maxwell's equations from known solutions by replacingEwithH, Hwith-E,ε with μ, and μ with ε.
A principle that if a theorem is true, it remains true if each object and operation is replaced by its dual; important in projective geometry and Boolean algebra.