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For questions about mathematical notation, i.e. the symbols used to represent mathematical objects and operations.

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Definition of term functions, in universal algebra

According to the definitions in Sankappanavar's universal algebra : Assume $p$ is a term, then $p(x_1,x_2,...,x_n)$ indicates that the variables occurring in $p$ are among $x_1,...,x_n$. But there is …