Local-global conjecture for the semigroup orbit of
Local-global conjecture for the semigroup orbit of
Define
The table of congruence and reciprocity obstructions specifies the stated restrictions on numerators and denominators in these orbits. Local-global conjecture for . The table completely characterizes the numbers that can appear as numerators or denominators in orbits of ; equivalently, every sufficiently large integer not ruled out by the given congruence and reciprocity obstructions appears in the orbit. This is supported by computational evidence in the paper, while a proof is not known.
Sources & referencesView supporting material
Primary source
James Rickards and Katherine E. Stange, “Reciprocity obstructions in semigroup orbits in SL(2, Z)”, arXiv:2401.01860 (2025).
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