How is $\displaystyle \Delta I$ defined for $\displaystyle I$ some interval on $\displaystyle \mathbb{R}$? Is it just $\displaystyle sup(I)-inf(I)$, that is, the Supremum of the interval minus the Infimum?
Thanks in advance.
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How is $\displaystyle \Delta I$ defined for $\displaystyle I$ some interval on $\displaystyle \mathbb{R}$? Is it just $\displaystyle sup(I)-inf(I)$, that is, the Supremum of the interval minus the Infimum?
Thanks in advance.