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  2. Non-obviousness in United States patent law - Wikipedia

    en.wikipedia.org/wiki/Non-obviousness_in_United...

    As a practical test for the pragmatic approach for lower courts to use, the Supreme Court proposed "unusual or surprising consequences" from the combination of old elements: "[O]nly when the whole in some way exceeds the sum of its parts is the accumulation of old devices patentable."

  3. Root locus analysis - Wikipedia

    en.wikipedia.org/wiki/Root_locus_analysis

    The equation z = e sT maps continuous s-plane poles (not zeros) into the z-domain, where T is the sampling period. The stable, left half s -plane maps into the interior of the unit circle of the z -plane, with the s -plane origin equating to |z| = 1 (because e 0 = 1).

  4. Domain (mathematical analysis) - Wikipedia

    en.wikipedia.org/wiki/Domain_(mathematical_analysis)

    In complex analysis, a complex domain (or simply domain) is any connected open subset of the complex plane C. For example, the entire complex plane is a domain, as is the open unit disk, the open upper half-plane, and so forth. Often, a complex domain serves as the domain of definition for a holomorphic function.

  5. Domain of a function - Wikipedia

    en.wikipedia.org/wiki/Domain_of_a_function

    The term domain is also commonly used in a different sense in mathematical analysis: a domain is a non-empty connected open set in a topological space. In particular, in real and complex analysis , a domain is a non-empty connected open subset of the real coordinate space R n {\displaystyle \mathbb {R} ^{n}} or the complex coordinate space C n ...

  6. Rational function - Wikipedia

    en.wikipedia.org/wiki/Rational_function

    The domain of f is the set of complex numbers such that (). Every rational function can be naturally extended to a function whose domain and range are the whole Riemann sphere (complex projective line). A complex rational function with degree one is a Möbius transformation.

  7. Time–frequency analysis - Wikipedia

    en.wikipedia.org/wiki/Time–frequency_analysis

    The filtering methods mentioned above can’t work well for every signal which may overlap in the time domain or in the frequency domain. By using the time–frequency distribution function, we can filter in the Euclidean time–frequency domain or in the fractional domain by employing the fractional Fourier transform. An example is shown below.

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    mail.aol.com

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  9. Domain separation - Wikipedia

    en.wikipedia.org/wiki/Domain_separation

    The input domain of a hash function is practically unlimited, it is easy to partition it among any number of derived functions, for example, by prepending or appending of a DST to the message. [10] [1] Domain separation is used within the implementation of some hash functions to produce multiple different functions from the same design. [11]