An open question is a genuinely unresolved matter of scholarly debate the atlas records against a philosopher, school, work or branch, such as a live dispute over interpretation or an argument's soundness that current scholarship has not settled. This category preserves honest uncertainty rather than papering over it with a false consensus, and each entry names what is actually contested and among whom. It excludes a settled historical or biographical fact merely awaiting citation, which belongs in the entity's own sourced properties rather than here.