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# Article

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Keywords:
partial abelian monoid; generalized effect algebra; preideal; Riesz decomposition property; central element
Summary:
We consider partial abelian monoids, in particular generalized effect algebras. From the given structures, we construct new ones by introducing a new operation \$\oplus \$, which is given by restriction of the original partial operation + with respect to a special subset called preideal. We bring some derived properties and characterizations of these new built structures, supporting the results by illustrative examples.
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