A class-wide exact-two obstruction for modulus 9 in finite odd covering systems, established through a computer-assisted mathematical proof with exact certificates and reproducible verification.
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Updated
Sep 12, 2026 - Python
A class-wide exact-two obstruction for modulus 9 in finite odd covering systems, established through a computer-assisted mathematical proof with exact certificates and reproducible verification.
SAT + verified LRAT certificate for a covering-system lower bound (Erdős #273), plus a segmented sieve extending verified ranges for #385 and #647 to 1.0011e12
Explicit verified IRDCS on [1,344] with every modulus divisible by 4
Kernel-checked Lean 4 exclusions for the Erdős–Selfridge odd covering problem (Erdős #7): any covering of ℤ by distinct odd moduli > 1 has lcm > 10000.
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