For example, although the Wikipedia article 2 "The geometry and topology of three-manifolds" is filed under the categories of interest "Hyperbolic geometry", "3-manifolds" and "Kleinian groups", the title as a whole does not represent a single concept.
the technical term "Riemannian manifold" would completely match the title of the Wikipedia 3 (or Encyclopedia of Math) article for the concept and would thus be identified as a type by our method.