human: Given a node-centered hypergraph: <hypergraph>, where nodes represent authors and hyperedges represent groups of authors who co-authored the same paper.

Details of the hypergraph:
Center node: "Elementary proofs of some q-identities of Jackson and Andrews-Jain"
  Abstract: We present elementary proofs of three q-identities of Jackson. They are Jackson's terminating q-analogue of Dixon's sum, Jackson's q-analogue of Clausen's formula, and a generalization of both of them. We also give an elementary proof of Jain's q-analogue of terminating Watson's summation formula, which is actually equivalent to Andrews's q-analogue of Watson's formula.

Connected through hyperedge HE-1 (induced by source paper "A Combinatorial Proof of a Symmetric $q$-Pfaff-Saalschütz Identity"):
  with members:
    (none)

Question: Please tell me which research area the center author belongs to. The 4 classes are: Computer science, Mathematics, Engineering, Economics, Psychology, Business. Directly output the class name.

gpt: Mathematics