Assertion: function | /r/CapableOf | start with the letter
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Source sentences:
text: Since there's really no significance to y, and it's just an arbitrary letter that represents the output of the function, sometimes it will be written as f(x) to indicate the the expression is a function of x. Note that you'll also see it written as g(x), h(x), and so forth, but f(x) is the most common because function starts with the letter