Abstract Viterbo has conjectured that any Lagrangian in the unit co-disc bundle of a torus which is Hamiltonian isotopic to zero-section satisfies uniform bound on its spectral norm; recent result by Shelukhin showed this indeed case. The modest goal our note explore two natural generalisations geometric setting norm fails: first, passing Legendrian isotopies contactisation (recall isotopy can ...

In the present paper, we give upper and lower bounds for the spectral norm of g-circulant matrix, whose the rst row entries are the classical Horadam numbers U (a,b) i . In addition, we also establish an explicit formula of the spectral norm for g-circulant matrix with the rst row ([U (a,b) 0 ] , [U (a,b) 1 ] , · · · , [U (a,b) n−1 ]).