Coherence (Bayesian statistics). In Bayesian decision theory, an inference system of probabilities and utilities is coherent if it is immune to the possibility of a "Dutch book paradox"; see coherence (philosophical gambling strategy).
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The property of coherence is the basis for commercial applications such as holography, the Sagnac gyroscope, radio antenna arrays, optical coherence tomography and telescope interferometers (astronomical optical interferometers and radio telescopes).
In optics, temporal coherence is measured in an interferometer such as the Michelson interferometer or Mach-Zehnder interferometer.
The quantum description of perfectly coherent paths is called a pure state, in which the two paths are combined in a superposition.
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