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A linear function when graphed takes the form of a straight line.
"The" exponential function is ex. A more general exponential function is any function of the form AeBx, for any non-xero constants "A" and "B". Alternately, Any function of the form CDx (for constants "C" and "D") would also be considered an exponential function. You can change from one form to the other.
A linear function is a function, or equation, that when graphed, will form a straight line.
sign function is math matrix function
I suppose it is written in invisible form!