[FOM] Intuitionists and excluded-middle
John McCarthy
jmc at steam.Stanford.EDU
Fri Oct 21 20:47:29 EDT 2005
If one adds a sufficiently small rational d to the smaller irrational
a, the sum a + d will still be irrational. To find a suitable d, one
needs to show that b - a is positive and that there is a smaller
positive rational d. Any of several ways of introducing the reals
will suffice for that. I imagine it can be done for algebraic
irrationals without introducing the reals.
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