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Erratum to: versatile and declarative dynamic programming using pair algebras

BMC Bioinformatics20067:214

Received: 19 April 2006

Accepted: 20 April 2006

Published: 20 April 2006

The original article was published in BMC Bioinformatics 2005 6:224

We have located a typesetting error in our recent publication in BMC Bioinformatics 2005,6:224 [1].

Although the error is quite minor (l' = l has been miswritten as l' L), it occurs in the central Definition 3 in the paper, and is also pasted into subsequent example code (both error sites on p.7, right column).

This error unfortunately looks mathematically plausible, although it is in contradiction with the given verbal explanations.

The corrected Definition 3 now reads as:

Definition 3 (Product operation on evaluation algebras) Let M and N be evaluation algebras over Σ. Their product M***N is an evaluation algebra over Σ and has the functions

fM***N((m1, n1)...(m k , n k )) = (f M (m1,...,m k ), f N (n1,...,n k )) for each f in Σ,

and the objective function

   hM***N([(m1, n1)...(m k , n k )]) = [(l, r)|

      l L,

      rh N ([r'|(l', r') ← [(m1, n1)...(m k , n k )], l' = l])],

      where L = h M ([m1,...,n k ]).


Authors’ Affiliations

Faculty of Technology, Bielefeld University, Germany


  1. Steffen P, Giegerich R: Versatile and declarative dynamic programming using pair algebras. BMC Bioinformatics 2005, 6: 224. 10.1186/1471-2105-6-224PubMed CentralView ArticlePubMedGoogle Scholar


© Steffen and Giegerich; licensee BioMed Central Ltd. 2006

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.