...line.
Recall that in geometry some mathematicians had already taken efforts to eliminate the dependence of the proofs on drawings.
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...numbers
For example, the Riemann hypothesis is equivalent to the following statement about the reals (4#4 is the Möbius function):

5#5

and this can in turn be reduced to a statement about the natural numbers.

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Stan Burris
Mon Feb 3 17:59:47 EST 1997