Top 20 Mathematics Universities in the World 2023:
The 2nd edition of Research.com ranking of the best universities in the discipline of Mathematics was created using data consolidated from multiple data sources including OpenAlex and CrossRef. The bibliometric data for evaluating the citation-based metrics were gathered on 21-12-2022. Position in the ranking is based on a sum of D-indexes (Discipline H-index) of all ranking researcher’s affiliated with a given institution. D-index includes exclusively papers and citation data for an examined discipline.
What is D-index approval threshold for Mathematics: The D-index threshold for including a researcher to be considered is placed at 30 if most of their publications are in the discipline of Mathematics. The inclusion factors for scholars to be considered into the ranking of top researchers are based on the D-index, proportion of the contributions made within the specific area plus the awards and achievements of the scholars. The D-index threshold for including leading scholars is set as an increment of 10 depending on the total number of researchers assessed for each discipline whilst making sure that the top 1% of leading researchers are incorporated into the list. We estimate a proximity of 30% or less between a scholar’s general H-index and their D-index.

https://research.com/university-rankings/mathematics