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BUILT-IN MATHEMATICA SYMBOL
DiscreteDelta
DiscreteDelta[n1, n2, ...]
gives the discrete delta function 
, equal to 
if all the 
are zero, and 
otherwise.
Details
- DiscreteDelta[0] gives
; DiscreteDelta[n] gives 
for other numeric n. - DiscreteDelta has attribute Orderless.
New in 4
