What does the notation $\circ$ mean? - Mathematics Stack …
https://math.stackexchange.com/questions/434678/what-does-the-notation-circ-mean
WEBThe symbol "$\circ$" denotes the composition of functions, composition of relations, or the composition of permutations, and more generally, denotes a binary operation, sometimes described as a law of composition, where $f\circ g$ is the function or operation resulting from performing the function/operation $g$, followed by the function ...
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