Tuple
# Definition 1
A Tuple of length $2$ is an Ordered Pair. A Tuple of length $n > 2$ consisting of $(x_{1}, x_{2}, …, x_{n})$ is the Ordered Pair $(x_{1}, (x_{2}, \dots, x_{n}))$, where $(x_{2}, \dots, x_n)$ is a Tuple of length $n-1$.
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A Tuple of length $2$ is an Ordered Pair. A Tuple of length $n > 2$ consisting of $(x_{1}, x_{2}, …, x_{n})$ is the Ordered Pair $(x_{1}, (x_{2}, \dots, x_{n}))$, where $(x_{2}, \dots, x_n)$ is a Tuple of length $n-1$.