A bi-metal is constructed with two dissimilar metals bonded together. The expansion factor is different in each metal. When heat is applied the bi-metal will bend in the direction of the metal with the least amount of expansion factor.
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Not every relation is a function. But every function is a relation. Function is just a part of relation.
The cubic function.
Range
A formula or graph are two ways to describe a math function. How a math function is described depends on the domain of the function or the complexity of the function.
The Mandelbrot graph is generated iteratively and so is a function of a function of a function ... and in that sense it is a composite function.