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Functions of various kinds are "the central objects of investigation"
in most fields of
modern mathematics. There are many ways to describe or represent a function. Some functions
may be defined by a formula or algorithm that tells how to compute the output for a given input.
Others are given by a picture, called the graph of the function.
A bond is a debt investment in which an investor loans money to an entity (typically corporate
or governmental) which borrows the funds for a defined period of time at a variable or fixed
interest rate.
Example of function:
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