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Can be expressed physical law,for example average speed like relation,but not like a function?Or speed can be only the function?I mean,why we use functions to describe physical phenomena?Is possible to describe every phenomenon with function and also by relation?For example a2 + b2 = c2 is relation,but can be it converted like a function?

I know,that my question is strange,but I m trying to understand,why we use function,and if the function is one of many possible ways to describe a nature.

Thanks