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A Function
Each variable has an exponent equal to one.
Any 4 points in the Cartesian plane determine a unique equation that is of degree at most three (i.e., a "cubic" equation). It is, of course, possible that the 4 points actually lie on a degree two ("quadratic"), a degree one ("linear"), or a degree zero ("constant") equation. However, if the 4 points do not lie on a constant, linear, or quadratic curve, then they will like on a unique cubic curve. In general, N points will determine a unique curve of degree at most (N-1).
A function assigns a unique value to each input of specified type. It expresses the intuited idea that one quantity completely determines the another quantity.
This is a trick question. If one is known, or a fact is known, then it is KNOWN. Like the word "unique." There is no more unique or most unique. Unique means one of a kind. So, in theory, more well known or most well known could suffice; but the term would be redundant.