2015-10-14 21:17:08 UTC+2, Phoenix:
Why is "n" different from x,z and f ?
>
> Shouldn't all of them need to be declared as variables in that case?
>
`n` is different because SageMath has a function called `n`,
which is short for `numerical_approximation`:
sage: n(pi)
3.14159265358979
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