A new theory of evidence for non-exclusive elementary propositions

Though probability theory has been used widely, it cannot treat quantities of ignorance well. To solve the problem, the Dempster-Shafer theory has been developed as a reasonable tool to represent situations in which various kinds of ignorance exist in our knowledge or information. However, the Dempster-Shafer theory assumes that elementary propositions are mutually exclusive. Therefore, we cannot treat non-exclusive elementary propositions in the Dempster-Shafer theory directly. In the paper a new theory is proposed to deal with non-exclusive elementary propositions, and is illustrated by a simple example.