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Topic: Dirac comb

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	Dirac equation Encyclopedia (Site not responding. Last check: 2007-10-29)
		In physics, the Dirac equation is a relativistic quantum mechanical wave equation formulated by British physicist Paul Dirac in 1928 and provides a description of elementary spin-½ particles, such as electrons, consistent with both the principles of quantum mechanics and the theory of special relativity.
		In the Dirac representation, the equation for ψ
		This is the basis for the use of the Dirac equation in quantum field theory.
	www.hallencyclopedia.com /topic/Dirac_equation.html (3018 words)

	Dirac comb - Wikipedia, the free encyclopedia
		A Dirac comb is an infinite series of Dirac delta functions spaced at intervals of T.
		In mathematics, a Dirac comb is a periodic Schwartz distribution constructed from Dirac delta functions
		The Fourier transform of a Dirac comb is also a Dirac comb.
	en.wikipedia.org /wiki/Dirac_comb (193 words)

	Dirac delta function - Wikipedia, the free encyclopedia
		The Dirac delta function, often referred to as the unit impulse function and introduced by the British theoretical physicist Paul Dirac, can usually be informally thought of as a function δ(x) that has the value of infinity for x = 0, the value zero elsewhere.
		Dirac functions can be of any size in which case their 'strength' A is defined by duration multiplied by amplitude.
		A so-called uniform "pulse train" of Dirac delta measures, which is known as a Dirac comb,or as the shah distribution, creates a sampling function, often used in digital signal processing (DSP) and discrete time signal analysis.
	en.wikipedia.org /wiki/Dirac_delta (1218 words)

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