Is there any formula for generating negative rational numbers? Can Calkin–Wilf tree be used for negative numbers?
2026-04-03 13:20:15.1775222415
How to obtain the negative rational numbers
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Yes. Multiply the value at each vertex by $-1$.
Bob's yer uncle!
Doing so demonstrates that that the set of negative rationals, like the set of positive rationals, is countably infinite.