premise: Phoenix, Arizona is the capital of Massachusetts.
hypothesis: Downtown Phoenix is the central business district ( CBD ) of the City of Phoenix , Arizona , United States . Phoenix ( [ ˈfiːnᵻks ] ) is the capital and most populous city of the U.S. state of Arizona . With 1,615,017 people , Phoenix is the fifth most populous city nationwide , the most populous state capital in the United States , and the only state capital with a population of more than one million residents . The University of Arizona ( also referred to as U of A , UA , or Arizona ) is a public research university in Tucson , Arizona , United States .