Add small-n ELG counting experiment (iso, rooted)

count_elgs.py enumerates triangulation iso-classes and counts Even Level
Graphs (G,v) per n: iso-classes (sources up to Aut) and flag-rooted
(4E/|Aut| * s, an exact integer since Aut acts freely on flags).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

papers/level_resolutions_of_maximal_planar_graphs/experiments/count_elgs.py

@@ -0,0 +1,109 @@
+"""
+Count Even Level Graphs (ELGs) for small n.
+
+An ELG is a pair (G, S) where G is a plane triangulation on n vertices,
+S = {v} a single source vertex, and every level subgraph L_k (vertices at
+BFS-distance k from v) is bipartite -- equivalently, every level cycle is
+even (Definition: even-level-graph, sibling paper).
+
+We report per n:
+  - tri      : # iso-classes of plane triangulations (maximal planar graphs)
+  - elg_iso  : # iso-classes of ELG *pairs* (G,v), i.e. valid sources counted
+               up to Aut(G)
+  - elg_root : # flag-rooted ELGs = sum over iso-classes of 4E/|Aut(G)| * s(G),
+               E = 3n-6, s(G) = # valid sources. Aut(G) acts freely on the 4E
+               flags, so each term is an exact integer -- the small-integer,
+               automorphism-free count (the natural one for closed forms).
+"""
+import time
+import networkx as nx
+from networkx.algorithms.isomorphism import GraphMatcher
+
+from triangulation_gen import enumerate_all_triangulations
+
+
+def is_even_level_graph(G, source):
+    """Every level subgraph L_k (BFS distance k from source) is bipartite,
+    equivalently every level cycle is even. Mirrors test_conjecture.py in
+    the even_level_graph_generators paper."""
+    levels = {v: float("inf") for v in G.nodes()}
+    from collections import deque
+    dq = deque()
+    for s in source:
+        levels[s] = 0
+        dq.append(s)
+    while dq:
+        v = dq.popleft()
+        for w in G[v]:
+            if levels[w] > levels[v] + 1:
+                levels[w] = levels[v] + 1
+                dq.append(w)
+    if any(l == float("inf") for l in levels.values()):
+        return False, None  # disconnected: source can't reach all vertices
+    for k in range(max(levels.values()) + 1):
+        L_k = G.subgraph([v for v in G.nodes() if levels[v] == k])
+        if not nx.is_bipartite(L_k):
+            return False, None
+    return True, levels
+
+
+def automorphisms(G):
+    """All automorphisms of G as node->node dict mappings."""
+    return list(GraphMatcher(G, G).isomorphisms_iter())
+
+
+def valid_sources(G):
+    """Vertices v such that (G, {v}) is an ELG."""
+    return [v for v in G.nodes()
+            if is_even_level_graph(G, frozenset({v}))[0]]
+
+
+def source_orbits(G, sources, autos):
+    """Number of Aut(G)-orbits among the given source vertices."""
+    src = set(sources)
+    seen, orbits = set(), 0
+    for v in sources:
+        if v in seen:
+            continue
+        orbits += 1
+        for a in autos:
+            seen.add(a[v])
+    return orbits
+
+
+def count_for_n(n):
+    tris = enumerate_all_triangulations(n)
+    flags = 4 * (3 * n - 6)   # # flags of any n-vertex triangulation, E = 3n-6
+    elg_iso = 0
+    elg_root = 0
+    n_elg_tris = 0          # triangulations admitting at least one ELG source
+    for G in tris:
+        srcs = valid_sources(G)
+        if not srcs:
+            continue
+        n_elg_tris += 1
+        autos = automorphisms(G)
+        aut_size = len(autos)
+        elg_iso += source_orbits(G, srcs, autos)
+        # Aut acts freely on flags, so flags//aut_size is exact per class.
+        assert flags % aut_size == 0, (n, aut_size, flags)
+        elg_root += (flags // aut_size) * len(srcs)
+    return {
+        "tri": len(tris),
+        "tri_with_elg": n_elg_tris,
+        "elg_iso": elg_iso,
+        "elg_root": elg_root,
+    }
+
+
+if __name__ == "__main__":
+    import sys
+    ns = [int(x) for x in sys.argv[1:]] or [4, 5, 6, 7, 8]
+    print(f"{'n':>3} {'tri':>6} {'tri+ELG':>8} {'elg_iso':>8} "
+          f"{'elg_root':>9}  {'time':>6}")
+    for n in ns:
+        t0 = time.time()
+        r = count_for_n(n)
+        print(f"{n:>3} {r['tri']:>6} {r['tri_with_elg']:>8} "
+              f"{r['elg_iso']:>8} {r['elg_root']:>9}  "
+              f"{time.time()-t0:>5.1f}s")

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