face_monochromatic_pairs: rename check_conj_3_8_scaled → check_conj_final_scaled; add n=21-24 test

Rename the shared helper module to a number-resistant name. Update
all 26 dependent scripts via sed.

Add experiments/test_n_21_to_24.py — extends the empirical check
beyond |V(G)| ≤ 20 to n_G ∈ [21, 24]. Checks per chord-apex+Kempe
colouring:
  (1) h_φ constant on V(K_b)? (counterexample to Corollary 5.4)
  (2) h_φ constant on V(K_b) ∪ V(K_c)? (counterexample to Conj 5.1)
  (3) Deciding face exists?

Writes results incrementally to test_n_21_to_24_results.jsonl (one
JSON line per triangulation, plus n-level and grand summaries).
Emits PROGRESS lines every 10 minutes (default) to stdout for live
monitoring.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
2026-05-25 08:01:29 -04:00
parent b20c8122da
commit 4ceae9c68a
32 changed files with 544 additions and 110 deletions
@@ -28,7 +28,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -29,7 +29,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -21,7 +21,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -17,7 +17,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -21,7 +21,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -23,7 +23,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -24,7 +24,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -28,7 +28,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -34,7 +34,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -16,7 +16,7 @@ the 4-edge-face criterion). Then we:
partial(f_n).
Aggregates per-n.
Run with: sage experiments/check_conj_3_8_scaled.py
Run with: sage experiments/check_conj_final_scaled.py
"""
from sage.all import Graph
from sage.graphs.graph_generators import graphs
@@ -7,7 +7,7 @@ Each Holton-McKay graph is itself a cubic plane graph $G'$; its dual is a
of a hypothetical minimal counterexample and apply the reduced-dual
construction at each of its pentagonal faces.
Reuses the testing infrastructure from check_conj_3_8_scaled.py.
Reuses the testing infrastructure from check_conj_final_scaled.py.
Run with: sage experiments/check_conj_on_holton_mckay.py
"""
@@ -19,7 +19,7 @@ from sage.all import Graph
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -28,7 +28,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -31,7 +31,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -26,7 +26,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -20,7 +20,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -28,7 +28,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -22,7 +22,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -23,7 +23,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -18,7 +18,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -24,7 +24,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -21,7 +21,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -33,7 +33,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -21,7 +21,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -21,7 +21,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -24,7 +24,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -24,7 +24,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -33,7 +33,7 @@ from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_3_8_scaled import (
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
@@ -0,0 +1,252 @@
"""Test Conjecture 5.1 (face-monochromatic-pair) on chord-apex+Kempe
colourings of reduced duals for n in [21, 24].
For each (G, v, i, φ) chord-apex+Kempe colouring, check:
(1) Is h_φ constant on V(K_b) V(K_c)? (= potential counterexample
to Conjecture 5.1)
(2) Is h_φ constant on V(K_b) alone? (= weaker condition, would
contradict Corollary 5.4)
(3) Does a deciding face exist (f V(K_b) V(K_c) and |f| 0
mod 3)? (= condition for the structural proof to apply)
The known empirical result for n 20 is 0/142,812 for (1) and (2),
and 142,812/142,812 for (3). We extend to n = 21, 22, 23, 24.
Results are written incrementally to results.jsonl in the cwd, so
that partial progress is preserved if the script is interrupted.
The script also prints PROGRESS lines (= one per triangulation
processed, or every 10 minutes elapsed, whichever first) that can
be tailed for live monitoring.
Run with: sage experiments/test_n_21_to_24.py
"""
import json
import os
import sys
import time
from pathlib import Path
from sage.all import Graph
from sage.graphs.graph_generators import graphs
HERE = os.path.dirname(os.path.abspath(__file__))
sys.path.insert(0, HERE)
from check_conj_final_scaled import (
apply_reduction,
proper_3_edge_colorings,
matches_chord_apex_kempe,
kempe_cycle_set,
edge_idx,
)
from check_heawood_on_kempe import dual_of, heawood_numbers, vertices_of_kempe
RESULTS_FILE = Path(HERE) / '..' / 'test_n_21_to_24_results.jsonl'
def find_deciding_face(H, V_union):
"""Return (face, |face|) for some deciding face, or None."""
for f in H.faces():
verts = {u for (u, v) in f} | {v for (u, v) in f}
if not verts.issubset(V_union):
continue
L = len(f)
if L % 3 != 0:
return f, L
return None
def test_one(D):
"""For a given dual D, iterate reductions + chord-apex+Kempe
colourings, return a dict of counters."""
D.is_planar(set_embedding=True)
n_col = 0
n_const_kb = 0
n_const_kb_kc_union = 0
n_no_deciding = 0
n_counterexamples = [] # save details of any counterexample
for face in D.faces():
if len(face) != 5: continue
for i_red in range(5):
res = apply_reduction(D, face, i_red, 9999)
if res is None: continue
H = res['H']; named = res['named']
H.is_planar(set_embedding=True)
edges, colorings = proper_3_edge_colorings(H)
cand = [c for c in colorings
if matches_chord_apex_kempe(edges, c, named)]
for col in cand:
n_col += 1
try:
h = heawood_numbers(H, edges, col)
except RuntimeError:
continue
merged_idx = edge_idx(edges, named['merged'])
a = col[merged_idx]
bs = [c for c in range(3) if c != a]
kc_b = kempe_cycle_set(edges, col, merged_idx, (a, bs[0]))
kc_c = kempe_cycle_set(edges, col, merged_idx, (a, bs[1]))
V_b = vertices_of_kempe(edges, kc_b)
V_c = vertices_of_kempe(edges, kc_c)
V_union = V_b | V_c
# Check constancy
h_b_vals = {h[v] for v in V_b}
h_union_vals = {h[v] for v in V_union}
if len(h_b_vals) == 1:
n_const_kb += 1
n_counterexamples.append({
'type': 'const_kb',
'n_V_b': len(V_b),
})
if len(h_union_vals) == 1:
n_const_kb_kc_union += 1
n_counterexamples.append({
'type': 'const_union',
'n_V_union': len(V_union),
})
# Check deciding face
dec = find_deciding_face(H, V_union)
if dec is None:
n_no_deciding += 1
n_counterexamples.append({
'type': 'no_deciding',
'n_V_union': len(V_union),
})
return n_col, n_const_kb, n_const_kb_kc_union, n_no_deciding, n_counterexamples
def write_result(record):
"""Append a single JSONL record."""
with open(RESULTS_FILE, 'a') as f:
f.write(json.dumps(record) + '\n')
f.flush()
def main(n_min=21, n_max=24, progress_every_seconds=600):
started_at = time.time()
# Clear / create the results file
print(f"Writing incremental results to {RESULTS_FILE}")
print(f"PROGRESS lines emitted every {progress_every_seconds}s "
f"(in addition to per-triangulation logs)")
sys.stdout.flush()
if RESULTS_FILE.exists():
# Preserve old log under .bak; new run starts fresh
bak = RESULTS_FILE.with_suffix(RESULTS_FILE.suffix + '.bak')
RESULTS_FILE.rename(bak)
print(f"Previous results moved to {bak}")
RESULTS_FILE.touch()
grand_col = 0
grand_const_kb = 0
grand_const_union = 0
grand_no_deciding = 0
last_progress = time.time()
for n in range(n_min, n_max + 1):
n_start = time.time()
print(f"\n=== n_G = {n} ===")
sys.stdout.flush()
try:
triangulations_iter = graphs.triangulations(n, minimum_degree=5)
except Exception as ex:
print(f"n={n}: cannot enumerate ({ex})")
continue
n_col_n = 0
n_const_kb_n = 0
n_const_union_n = 0
n_no_deciding_n = 0
tri_idx = 0
for G in triangulations_iter:
G.is_planar(set_embedding=True)
D = dual_of(G)
tri_start = time.time()
nc, nck, ncu, nnd, examples = test_one(D)
tri_elapsed = time.time() - tri_start
n_col_n += nc
n_const_kb_n += nck
n_const_union_n += ncu
n_no_deciding_n += nnd
# Write per-triangulation record
record = {
'n_G': n, 'tri_idx': tri_idx,
'n_col': nc,
'n_const_kb': nck,
'n_const_kb_kc_union': ncu,
'n_no_deciding': nnd,
'tri_elapsed_s': round(tri_elapsed, 2),
'wall_elapsed_s': round(time.time() - started_at, 2),
'examples': examples,
}
write_result(record)
# Time-based progress line
now = time.time()
if now - last_progress >= progress_every_seconds:
wall_min = (now - started_at) / 60
print(f"PROGRESS: wall {wall_min:.1f} min; "
f"n={n} tri {tri_idx+1} done ({tri_elapsed:.1f}s); "
f"running totals @n={n}: col={n_col_n}, "
f"const_kb={n_const_kb_n}, "
f"const_union={n_const_union_n}, "
f"no_dec={n_no_deciding_n}")
sys.stdout.flush()
last_progress = now
tri_idx += 1
n_elapsed = time.time() - n_start
# n-level summary record
summary = {
'type': 'n_summary',
'n_G': n,
'n_tri': tri_idx,
'n_col': n_col_n,
'n_const_kb': n_const_kb_n,
'n_const_kb_kc_union': n_const_union_n,
'n_no_deciding': n_no_deciding_n,
'n_elapsed_s': round(n_elapsed, 2),
'wall_elapsed_s': round(time.time() - started_at, 2),
}
write_result(summary)
print(f"\nn={n}: {tri_idx} triangulations, {n_col_n} colourings "
f"[{n_elapsed:.0f}s]")
print(f" const_kb: {n_const_kb_n}")
print(f" const_kb_kc_union: {n_const_union_n}")
print(f" no_deciding_face: {n_no_deciding_n}")
sys.stdout.flush()
grand_col += n_col_n
grand_const_kb += n_const_kb_n
grand_const_union += n_const_union_n
grand_no_deciding += n_no_deciding_n
total_elapsed = time.time() - started_at
final = {
'type': 'grand_summary',
'n_min': n_min, 'n_max': n_max,
'grand_col': grand_col,
'grand_const_kb': grand_const_kb,
'grand_const_kb_kc_union': grand_const_union,
'grand_no_deciding': grand_no_deciding,
'wall_elapsed_s': round(total_elapsed, 2),
}
write_result(final)
print("\n" + "=" * 70)
print(f"DONE: n in [{n_min}, {n_max}], "
f"{grand_col} chord-apex+Kempe colourings tested "
f"in {total_elapsed/60:.1f} min")
print(f" const_kb: {grand_const_kb}")
print(f" const_kb_kc_union: {grand_const_union}")
print(f" no_deciding_face: {grand_no_deciding}")
if (grand_const_kb == 0 and grand_const_union == 0
and grand_no_deciding == 0):
print("✓ Conjecture 5.1 + Deciding-face conjecture EMPIRICALLY "
"EXTENDED to n_G ≤ {}".format(n_max))
if __name__ == '__main__':
import sys
n_min = int(sys.argv[1]) if len(sys.argv) > 1 else 21
n_max = int(sys.argv[2]) if len(sys.argv) > 2 else 24
main(n_min=n_min, n_max=n_max)
+37 -8
View File
@@ -40,21 +40,50 @@
\newlabel{lem:both-kempe-constant}{{5.3}{11}}
\@writefile{lof}{\contentsline {figure}{\numberline {5}{\ignorespaces The two cases in the proof of Lemma\nonbreakingspace 5.2\hbox {}. Vertices $v_0, v_1$ are consecutive on the $\{a, b\}$-Kempe cycle $K$, joined by an edge $e$, with the lemma's hypothesis $h_\varphi (v_0) = h_\varphi (v_1) = +1$ --- so both vertices share the clockwise colour order $(a, b, c)$. \emph {Left (Case\nonbreakingspace A):} when $\varphi (e) = a$, the colour-$b$ edge at $v_0$ lies south of $e$ (on $\partial F_R$) and the colour-$b$ edge at $v_1$ lies north of $e$ (on $\partial F_L$); the two would-be witness edges are on opposite faces, so no face of $\setbox \z@ \hbox {\mathsurround \z@ $\textstyle G$}\mathaccent "0362{G}'_{v,i}$ contains both. \emph {Right (Case\nonbreakingspace B):} when $\varphi (e) = b$, the colour-$a$ edges at $v_0, v_1$ are likewise on opposite sides of $e$. In either case the clause-$(3)$ arc of Conjecture\nonbreakingspace 5.1\hbox {} cannot be realised at $e$.}}{12}{}\protected@file@percent }
\newlabel{fig:lemma-kempe-heawood}{{5}{12}}
\citation{Heawood1898}
\newlabel{cor:single-cycle-non-constancy}{{5.4}{13}}
\newlabel{rem:heawood-empirical}{{5.5}{13}}
\newlabel{rem:conj-3-6-empirical}{{5.6}{13}}
\newlabel{conj:face-monochromatic-pair-strengthened}{{5.7}{14}}
\newlabel{rem:conj-3-8-empirical}{{5.8}{14}}
\newlabel{conj:no-two-constant-kempe-cycles}{{5.5}{13}}
\newlabel{rem:no-two-constant-kempe-cycles-counterexample}{{5.6}{13}}
\@writefile{lof}{\contentsline {figure}{\numberline {6}{\ignorespaces Smallest counterexample to Conjecture\nonbreakingspace 5.5\hbox {}: a $C_{28}$ fullerene-style cubic plane graph (12 pentagons + 4 hexagons) with a proper $3$-edge-colouring on which $h_\varphi $ is simultaneously constant ($\equiv -1$) on the red/blue $12$-cycle and the red/green $12$-cycle, which share the colour-red edge $(0, 1)$. Light-shaded nodes are on $V(K_0) \cap V(K_1)$; medium-shaded on $V(K_0) \cup V(K_1) \setminus V(K_0) \cap V(K_1)$; grey on neither.}}{14}{}\protected@file@percent }
\newlabel{fig:no-two-constant-kempe-counterexample}{{6}{14}}
\@writefile{toc}{\contentsline {subsection}{\tocsubsection {}{}{A reduction of Conjecture 5.1\hbox {} via Heawood's face-sum identity}}{14}{}\protected@file@percent }
\newlabel{eq:heawood-face-sum}{{5.1}{14}}
\newlabel{conj:deciding-face}{{5.7}{14}}
\newlabel{thm:deciding-face-implies-conj-5-1}{{5.8}{14}}
\@writefile{toc}{\contentsline {subsection}{\tocsubsection {}{}{A partial structural proof of Conjecture\nonbreakingspace 5.7\hbox {}}}{15}{}\protected@file@percent }
\newlabel{def:flank-face}{{5.9}{15}}
\newlabel{lem:flank-length}{{5.10}{15}}
\newlabel{lem:flank-covering-base}{{5.11}{15}}
\newlabel{lem:flank-covering-hex}{{5.12}{16}}
\newlabel{thm:deciding-face-partial}{{5.13}{17}}
\newlabel{rem:n-i-6-flank-fails}{{5.14}{17}}
\newlabel{def:outer-face}{{5.15}{17}}
\newlabel{lem:outer-face-length}{{5.16}{17}}
\newlabel{lem:outer-face-covering-base}{{5.17}{17}}
\newlabel{thm:deciding-face-partial-extended}{{5.18}{18}}
\newlabel{rem:deciding-face-remaining-case}{{5.19}{18}}
\newlabel{conj:gprime-pentagon-fallback}{{5.20}{18}}
\newlabel{lem:gprime-pigeonhole}{{5.21}{18}}
\newlabel{rem:gprime-pigeonhole-stop}{{5.22}{18}}
\citation{AH77a}
\citation{AHK77}
\citation{RSST97}
\citation{Gonthier08}
\newlabel{rem:deciding-face-empirical}{{5.23}{20}}
\newlabel{rem:heawood-empirical}{{5.24}{20}}
\newlabel{rem:conj-3-6-empirical}{{5.25}{21}}
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\OT1/cmr/m/n/10 colour-ings on which the par-tial struc-tural proof leaves a ga
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