Sentence:  It is clear that each vector in the range of * * f is in * * f for if |a is in the range of * * f , then * * f and so * * f because * * f <WSD>is</WSD> divisible by the minimal polynomial p . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)