PUN

Northrop Frye (1912 – 1991) made many trenchant observations on literature. So if you know someone compiling such a list, you might want to ask them “Would you like Frye’s with that?”

bound variables versus free variables

Here is the link to the Wikipedia article on this topic.

In spite of the distinction between the two types of variables, it is a common practice to conflate them, for the sake of convenience. For example, in Wikipedia’s article on arithmetic progressions, the variable ‘n’ is used both as a bound variable, for defining the sequence, and as a free variable, for specifying the number of terms to be summed.

Here is the link to the Wikipedia article on arithmetic progressions.

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[Mathematics]