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4. In order to develop algebraic topology, one of the basic concepts needed (see
definitions in Section 2) is infinite complexes (of modules, for instance). Some
attempts have been made to produce an implementation of them (see [8]),
but definitive results have not been obtained yet. For their implementation,
lazy lists or extensible records might be used, but these ideas will be studied
in future work.
Acknowledgements
We are grateful to Wolfgang Windsteiger and the anonymous referees for the
useful comments on the previous version of this paper.
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