Bracewell's term for the rectangle function.
Gate Function
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References
Bracewell, R. The Fourier Transform and Its Applications, 3rd ed. New York: McGraw-Hill, 1999.Referenced on Wolfram|Alpha
Gate FunctionCite this as:
Weisstein, Eric W. "Gate Function." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/GateFunction.html