Measuring uncertainty in orthopairs

In many situations information comes in bipolar form. Orthopairs are a simple tool to represent and study this kind of information, where objects are classified in three different classes: positive, negative and boundary. The scope of this work is to introduce some uncertainty measures on orthopairs. Two main cases are investigated: a single orthopair and a collection of orthopairs. Some ideas are taken from neighbouring disciplines, such as fuzzy sets, intuitionistic fuzzy sets, rough sets and possibility theory.