An interval is a range of real numbers, whose end points will be
floats with at least 15 significant digits. The interval from a to
b is created with i[a,b].
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If a > b, then i[a,b] returns
i[evalf(b,15)-epsilon,evalf(a,15)+epsilon].
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Intervals can also be created by following a decimal number with a
question mark. If the decimal number contains n digits, the
interval will be centered at a and have width 2· 10−n.
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