Abstract
ABSTRACT Arrow (or tree, or branch) diagrams are sometimes introduced to freshman calculus students as a mnemonic device for applying the chain rule to functions of several variables. We suggest a particular format for an arrow diagram that can be introduced to students early on as a way to internalize the notion of a composition of functions, and that later can be used as a mnemonic device for applying the chain rule to functions both of one and of several variables.
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