Dirac delta function
Sign in to savepseudo-function δ such that an integral of δ(x-c)f(x) always takes the value of f(c)
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Schematic representation of the Dirac delta function by a line surmounted by an arrow. The height of the arrow is usually meant to specify the value of any multiplicative constant, which will give the area under the function. The other convention is to write the area next to the arrowhead.
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