A limited-memory Riemannian symmetric rank-one trust-region method with an efficient algorithm for its subproblem⁎The author WH was partially supported by the Fundamental Research Funds for the Central Universities (NO. 20720190060) and National Natural Science Foundation of China (NO. 12001455). The work of KAG is partially supported by the U.S. National Science Foundation under grant DBI 1934157. Issue 9 (2021)