Triangular bases of integral closures

In this work, we consider the problem of computing triangular bases of integral closures of one-dimensional local rings. Let $(K,v)$ be a discrete valued field with valuation ring $\mathcal{O}$ and let $\mathfrak{m}$ be the maximal ideal. We take $f\in \mathcal{O}[x]$, a monic irreducible polynomial of degree $n$ and consider the extension $L = K[x]/(f(x))$aswellas$$\mathcal{O}$_{L}$theintegralclosureof$$\mathcal{O}$$in$L$,whichwesupposetobefinitelygeneratedasan$$\mathcal{O}$$-module. The algorithm $\mathrm{MaxMin}$, presented in this paper, computes triangular bases of fractional ideals of ${\mathcal{O}}_L$. The theoretical complexity is equivalent to current state of the art methods and in practice is almost always faster. It is also considerably faster than the routines found in standard computer algebra systems, excepting some cases involving very small field extensions.