According to Dempster-Shafer theory for uncertainty management, where $Bel(A)$…

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According to Dempster-Shafer theory for uncertainty management, where $Bel(A)$ denotes belief of event $A$.

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In probability theory,

$P(A)+P(\neg A)=1$

But in Dempster-Shafer theory, belief values need not add up to $1$ because some uncertainty may remain unassigned.

So,

$Bel(A)+Bel(\neg A)\le 1$

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