Abstract
In 1998 the author showed that the canonical extension of a bounded modular lattice need not be modular. The proof was indirect, using a deep result of Kaplansky. In this note we give an explicit example.
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References
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Harding, J. Modularity is not canonical. Algebra Univers. 80, 8 (2019). https://doi.org/10.1007/s00012-019-0582-8
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DOI: https://doi.org/10.1007/s00012-019-0582-8