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Proposition: Antidifferences are Unique Up to a Periodic Constant
If the indefinite sum $\sum f(x)$ exists, then it is unique, except a periodic constant, i.e. a complexvalued function $P:\mathbb C\to\mathbb C$ with the property $P(x+1)=P.$
In other words, every indefinite sum in the form $$F(x)=\sum f(x)+P(x)$$ is unique.
Notes
 This proposition is stated analogously to the proposition about antiderivatives are unique up to a constant.
 Thus, the periodic constant $P(x)$ plays the same role for the indefinite sum as the "constant" plays for the integral.
Table of Contents
Proofs: 1
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Propositions: 1
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References
Bibliography
 Graham L. Ronald, Knuth E. Donald, Patashnik Oren: "Concrete Mathematics", AddisonWesley, 1994, 2nd Edition
 Miller, Kenneth S.: "An Introduction to the Calculus of Finite Differences And Difference Equations", Dover Publications, Inc, 1960
 Bool, George: "A Treatise on the Calculus of Finite Differences", Dover Publications, Inc., 1960