Firstly, it is shown that the most common sixteen pairs of covering approximation operators can be grouped into five pairs of dual covering approximation operators and six pairs of non-dual covering approximation operators according to definitions based on element, granule, and subsystem.
Finally, we investigate the relationships between the covering approximation operators and evidence theory.
It shows that some kinds of covering approximation operators can be characterized by belief and plausibility functions, while others do not share this property.
Secondly, we define the rough degree and precision for the purpose of characterizing the uncertainty of these summarized covering approximation operators under a unified framework.
The sufficient conditions under which covering approximation operators can be measured by belief and plausibility functions are further explored, and the corresponding counterexamples are given to illustrate those that cannot be measured.
The team is at a disadvantage because it pays $5 million a year for the right to use Nationwide Arena in addition to covering the operating costs of the arena (the team pays stadium operator SMG to run the building).
The future of the Middle East bureau, which has two reporters and a camera operator covering Jerusalem and Beirut, is also under review.
About 20 percent of the generation capacity overseen by PJM Interconnection, a regional transmission operator covering 13 northeastern and mid-Atlantic states, is used less than 100 hours a year, according to Lester B. Lave, a professor of economics at Carnegie Mellon's school of business.
Noordin says the company has 500 taxis registered, and has a deal with the airport taxi operator, covering another 2,000 cars.
Three UK, a subsidiary of HWL is the UK's fastest growing 3G network operator covering 98% of the UK population and is now rolling out 4G to its customers.
