Sure. In the simplest case, a function, such as f(x), is simply a rule to determine a number, based on another number. You can define both the original number and the resulting number to be any type of number (or other object) you want.
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fx=5x1 / 9
if x is compact, you are simply multiplying the compact number, therefore, 'fx' will also be compact.
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A vector is characterized by a magnitude, direction and sense of direction. If you are referring to the magnitude of a vector, it cannot be negative because of the way the magnitude is calculated. For example, vector F has components Fx and Fy. The magnitude of F is (Fx^2+Fy^2)^(1/2)However, you could see something like -F. What you are really looking at is multiplying a vector, F by -1. What this means is that -F has the same magnitude and line of action as F, but has an opposite direction as F.
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