Jinc Function
The jinc function is defined as
 |
(1)
|
where 
is a Bessel
function of the first kind, and satisfies 
.
The derivative of the jinc function is given by
 |
(2)
|
The function is sometimes normalized by multiplying by a factor of 2 so that 
(Siegman 1986, p. 729).
The first real inflection point of the function occurs when
 |
(3)
|
namely 2.29991033... (OEIS A133920).
The unique real fixed point occurs at 0.48541702373... (OEIS A133921).
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Bessel functions