Uniqueness of the 2-universality Criterion


Kim, Kim, and Oh gave a minimal criterion for the 2-universality of positivedefinite integer-matrix quadratic forms. We show that this 2-universality criterion is unique in the sense of the uniqueness of the Conway-Schneeberger Fifteen Theorem.

DOI Code: 10.1285/i15900932v28n2p203

Keywords: 2-universality; universality criteria; quadratic forms

Classification: 11E20; 11E25

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