A colon is used prior to describing a sequence.
Example:
She makes a peanut butter and jelly sandwich: first, spreading peanut butter on a slice of bread; second, spreading the jelly on the other slice of bread; and third, smashing the two together.
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Basic knowledge of addition and subtraction.
A general coordinate system had to be devised prior to describing planes or other objects. As provided in the link, Rene Descartes is considered the founder of the Cartesian coordinate system in 1637, but Fermat also made contributions. See related links on the lives of Descartes and Fermat.
If the formula for additional terms was the summation of the term before it, the nth term of the series would be the sum of all terms prior. In other words it would be the summation of a through n minus 1.
prioirandposterior dist
Prior department costs behave the same as direct materials, which are typically added at the start of production. They are treated separately because they represent the accumulation of costs from previous departments rather than the receipt of materials from the stores area. It is helpful to separate prior department costs from other costs because the manager of the department receiving the transferred units has no control over the costs incurred in prior departments. Thus, the prior department costs are not useful for evaluating the performance of the manager of the department receiving the units.