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Topic: Differential analyser

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	Encyclopedia :: encyclopedia : Differential geometry (Site not responding. Last check: 2007-10-20)
		In mathematics, projective differential geometry is the study of differential geometry, from the point of view of properties that are invariant under the projective group.
		Élie Cartan formulated the idea of a general projective connection, as part of his method of moving frames; abstractly speaking, this is the level of generality at which the Erlangen program can be reconciled with differential geometry, while it also develops the oldest part of the theory (for the projective line), namely the Schwarzian derivative.
		The ideas of projective differential geometry recur in mathematics and its applications, but the formulations given are still rooted in the language of the early twentieth century.
	www.hallencyclopedia.com /Differential_geometry (332 words)

	Computer (Site not responding. Last check: 2007-10-20)
		The OED2 lists the year 1897 as the first year the word was used to refer to a mechanical calculating device.
		By 1946 several qualifiers were introduced by the OED2 to differentiate between the different types of machine.
		Many classes of computer that are no longer used, such as differential analyzers, are not commonly included in such lists.
	www.freedownloadsoft.com /info/computer.html (3601 words)

	Modeling/Forecasting Information Sciences
		Mechanical device technology in the ball and disk differential analyzer had been taken to its limit and was inadequate.
		This led to the development of the operational amplifier in which a precision passive feedback network around an imprecise high-gain invertor is used to simulate the linear differential equations corresponding to the network (Smith and Wood, 1959).
		It also led to the development of the digital differential analyzer in which the differential equations are solved by incrementing digital registers (Lebedev, 1960; Mayorov and Chu, 1964).
	btlab.cpsc.ucalgary.ca /~gaines/reports/MFIT/InfSci/index.html (5551 words)

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