Between

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Between[x, {min, max}]

equivalent to min <= x <= max.

Between[x, { {$min_1$, $max_1$}, {$min_2$, $max_2$}, ...]

equivalent to $min_1$ <= x <= $max_1$ || $min_2$ <= x <= $max_2$ ...

Between[range]

operator form that yields Between[x, range] when applied to expression x.

Check that 6 is in range 4..10:

Same as above in operator form:

Between works with irrational numbers:

If more than an interval is given, Between returns True if x belongs to one of them:

BooleanQ