# metadata.dc.description.abstract[].value
We characterize the finite codimension sub-k-algebras of $\mathbf{k} \llbracket t \rrbracket$ as the solutions of a computable finite family of higher differential operators. For this end, we establish a duality between such a sub-algebras and the finite codimension $\mathbf{k}$-vector spaces of $\mathbf{k}[u]$, this ring acts on $\mathbf{k} \llbracket t \rrbracket$ by differentiation.

# metadata.dc.relation.ispartof[].value
Canadian Mathematical Bulletin-Bulletin Canadien de Mathematiques, 2024, vol. 67, num.3, p. 633-647

# metadata.dc.source[].value
Articles publicats en revistes (Matemàtiques i Informàtica)