Abstract
The paper establishes the invariance of the simplex-module algorithm for expanding real numbers α = (α1, …, αd) in multidimensional continued fractions under linear-fractional transformations $$ {\alpha}^{\prime }=\left({\alpha}_1^{\prime },\dots, {\alpha}_d^1\right)=U\left\langle \alpha \right\rangle $$ with matrices U from the unimodular group GLd+1(ℤ). It is shown that the convergents of the transformed collections of numbers α′ satisfy the same recurrence relation and have the same approximation order.
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