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Lower bound
The lower bound of a rounded or measured quantity is the smallest value the original (exact) quantity could have had, given the stated accuracy.
Rational exponent
An exponent of the form $\frac{m}{n}$ where $m$ and $n$ are integers and $n\neq 0$.
Upper bound
The upper bound of a rounded or measured quantity is the largest value the original (exact) quantity could have had, given the stated accuracy. For continuous data, the true value is strictly less than this upper bound.