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Petr Matas (talk | contribs) →Graph of a non-function relation: this has nothing to do with polynomials |
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In some cases the relation between two real variables cannot be written in the form <math>y=f(x)</math>. In other words, it is not a function. Nevertheless, the set of all points given by the relation is still a two-dimensional graph, as in the accompanying graph of the circle <math>(x-a)^2+(y-b)^2=1.</math>
An [[image (mathematics)|image]] of a [[plane curve]] is
==Superimposed graphs of more than one function==
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