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``Re: Imaginary irrational number?'' by rm50 on 2007-04-15 16:54:47
By the way, the Springer on line encyclopedia is curiously indeterminate about this. They say that an irrational is a "number that is not a rational number" but go on to discuss it in terms of a geometric length incommensurate with 1. All the examples are on the real line.

Mathworld simply does not say, but again all the examples are on the real line.
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