ACT OF UNION BETWEEN THE EASTERN AND WESTERN CHEROKEES. WHEREAS, our fathers have existed as a separate and distinct Nation, in the possession and exercise of the essential and appropriate attributes of sovereignty, from a period extending into antiquity, beyond the records and memory of man; and
A surjective function f from the real numbers to the real numbers possesses an inverse as long as it is one-to-one, i.e. as long as the graph of y = f(x) has, for each possible y value only one corresponding x value, and thus passes the horizontal line test.
The exponential function is one of the most important functions in mathematics (though it would have to admit that the linear function ranks even higher in importance). To form an exponential function, we let the independent variable be the exponent. A simple example is the function $$f(x)=2^x.$$. As illustrated in the above graph of $f$, the exponential function increases rapidly. Exponential functions are solutions to the simplest types of dynamical systems.