  We investigate different systems for extracting mathematical entities from
English texts in the mathematical field of category theory as a first step for
constructing a mathematical knowledge graph. We consider four different term
extractors and compare their results. This small experiment showcases some of
the issues with the construction and evaluation of terms extracted from noisy
domain text. We also make available two open corpora in research mathematics,
in particular in category theory: a small corpus of 755 abstracts from the
journal TAC (3188 sentences), and a larger corpus from the nLab community wiki
(15,000 sentences).
