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・ Coherence scanning interferometry
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Coherent (operating system)
・ Coherent addition
・ Coherent anti-Stokes Raman spectroscopy
・ Coherent backscattering
・ Coherent control
・ Coherent diffraction imaging
・ Coherent duality
・ Coherent effects in semiconductor optics
・ Coherent electromagnetic radio tomography
・ Coherent file distribution protocol
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・ Coherent perfect absorber
・ Coherent potential approximation
・ Coherent processing interval
・ Coherent ring


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Coherent (operating system) : ウィキペディア英語版
Coherent (operating system)

__NOTOC__
Coherent is a clone of the Unix operating system for IBM PC compatibles and other microcomputers, developed and sold by the now-defunct Mark Williams Company (MWC). Historically, the operating system was a proprietary product, but it became open source in 2015, released under a 3-clause BSD License.
==Development==
Coherent was not Unix; the Mark Williams Company had no rights to either the Unix trademark or the AT&T/Bell Labs source code. In the early years of its existence, MWC received a visit from an AT&T delegation looking to determine whether MWC was infringing on AT&T Unix property. The delegation included Dennis Ritchie, who concluded that "it was very hard to believe that Coherent and its basic applications were not created without considerable study of the OS code and details of its applications" but "that looking at various corners (peculiarities, bugs, etc. that I knew about in the Unix distributions of the time ) I couldn't find anything that was copied. It might have been that some parts were written with () source nearby, but at least the effort had been made to rewrite. If it came to it, I could never honestly testify () that what they generated was irreproducible from the manual."
Much of the operating system was written by alumni from the University of Waterloo: Tom Duff, Dave Conroy, Randall Howard, Johann George, and Trevor John Thompson. Significant contributions were also made by people such as Nigel Bree (from Auckland, New Zealand), the later author of Ghost.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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