Wan, Zhexian On rational bases of subspaces of \(F((D))^ n\). (English) Zbl 0861.94025 Northeast. Math. J. 12, No. 1, 5-7 (1996). It is shown that there exist subspaces of the vector space of \(n\)-dimensional row vectors over the field of formal Laurent series which do not have rational bases. This result has applications in the theory of convolutional codes. Reviewer: R.Johannesson (Lund) MSC: 94B10 Convolutional codes Keywords:field of rational functions; field of formal Laurent series; rational bases; convolutional codes PDFBibTeX XMLCite \textit{Z. Wan}, Northeast. Math. J. 12, No. 1, 5--7 (1996; Zbl 0861.94025)