didericis
db245eecea
- Promote Prop 3.1 (outerplanarity of level subgraphs) to Theorem 3.1 with a proof by contradiction via a BFS-path argument; drop the $n \leq 10$ caveat and the now-resolved open question. - Add Section 5 "An edge-flip resolution algorithm": apex classification of $L_k$-edges, bridge lemma, cross-level flip pass, definition of tricky-everywhere odd cycles and facial depth (seeded from inner faces with $\geq 2$ outer-face edges), and the depth-guided flip procedure. Observation 5.5 records empirical termination at $n = 9, 10, 11$; Question 5.6 asks if it holds in general. - Add experiments/depth_monovariant_check.py (sanity check over triangulation iso-classes, confirms the count-of-tricky-faces monovariant strictly decreases per flip on all 1400 tricky configs at $n \leq 11$), viz_cycling.py and debug_cycling.py, and cycling_visualization.png illustrating the depth-definition fix. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
math-research
Personal mathematics research repository by Eric Bauerfeld. Papers are written in AMS-LaTeX using the amsart document class.
Papers
kempe_style_search_for_smaller_contradiction
Humans Suffice: A Novel Proof of the Four Color Theorem
An in-progress proof of the Four Color Theorem via a minimal counterexample argument. The paper builds on Kempe's 1879 strategy — establishing valid cases for vertices of degree ≤ 4, then extending the argument to the degree-5 case using properties of non-adjacent degree-5 vertices, merged subgraphs, and locked colorings.
plane_depth_labelling
Plane Depth Labelling
Early-stage paper. Title and author information set; content in progress.
Creating a New Paper
Use run.sh to scaffold a new paper from the AMS-LaTeX template:
./run.sh init_paper "Your Paper Title"
This creates a new directory (name derived from the title) containing a paper.tex pre-filled with the title and author.
Setup
The Python library code in lib/ requires SageMath. Run setup once per machine:
./run.sh setup <sage_python_path> <sage_site_packages> [system_name]
sage_python_path— path to the SageMath Python interpreter (e.g./opt/sage/local/bin/python3)sage_site_packages— path to SageMath's site-packages directorysystem_name— optional label for this machine (defaults tohostname -s); used to store per-machine env files as.env.<system_name>
On subsequent runs the paths default to whatever was saved in .env, so ./run.sh setup alone re-runs setup with the existing configuration.
Setup also compiles the plantri submodule via make.
Running Sage
To run a Sage script with plantri available on PATH:
./run.sh sage <script.py> [args...]
Or to open an interactive Sage session:
./run.sh sage
Linting
./run.sh lint
Runs pyright and pylint on lib/ using the SageMath Python interpreter.
Shell Completion
To enable tab-completion for run.sh in zsh, add this to your .zshrc:
eval "$(path/to/run.sh completion)"
Or source it once in the current shell session:
eval "$(./run.sh completion)"
Building
Papers are compiled with LaTeX. From within a paper directory:
latexmk -pdf paper.tex