Abstract
We define the canonical representative for the equivalence class consisting of all polynomial- and quadratic differential operators that take the same values on a given subspace of C ∞ ( R n , R w ) . We also examine the relation of this definition with that given in a special case in [J.C. Willems, H.L. Trentelman, On quadratic differential forms, SIAM J. Control Optim. 36 (1998) 1703–1749].
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