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Published online by Cambridge University Press: 20 November 2018
Quantum tori with graded involution appear as coordinate algebras of extended affine Lie algebras of type
${{\text{A}}_{1}}$ ,
$\text{C}$ and
$\text{BC}$ . We classify them in the category of algebras with involution. From this, we obtain precise information on the root systems of extended affine Lie algebras of type
$\text{C}$ .