<Dd> a n = a m + (n − m) d (\ displaystyle \ a_ (n) = a_ (m) + (n-m) d). </Dd> <P> A finite portion of an arithmetic progression is called a finite arithmetic progression and sometimes just called an arithmetic progression . The sum of a finite arithmetic progression is called an arithmetic series . </P> <P> The behavior of the arithmetic progression depends on the common difference d . If the common difference is: </P> <Ul> <Li> positive, then the members (terms) will grow towards positive infinity; </Li> <Li> negative, then the members (terms) will grow towards negative infinity . </Li> </Ul>

What does d stand for in arithmetic sequence