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A 1-dimensional interval (a, b) is continuous if for any k in (0, 1) the point a + k*(b-a) = a*(1-k) + k*b is also in the interval.

This is equivalent to the statement that every point on the line joining a and b is in the interval.

The above can be extended to more dimensions analogously.

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Q: How do you determine if an interval is continuous?
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