Tag Archives: idempotents

Road closures and idempotent-generated semigroups

The University of St Andrews is installing a biomass boiler, to provide hot water to heat University buildings, on the old paper mill site at Guardbridge. The water has to be piped four miles to St Andrews, and this big … Continue reading

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Permutation groups in Bristol

On 1 June, a meeting of the “Groups and Applications” triangle was held in Bristol. (This peripatetic meeting was a long thin triangle with vertices London, Birmingham and Manchester, but with the inclusion of Bristol it is not clear what … Continue reading

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Generating singular maps

Last week, Max Gadouleau and Alonso Castillo-Ramirez visited St Andrews. With James Mitchell, we worked on a problem about generating the semigroup of singular maps on a set (the full transformation semigroup minus the symmetric group). As usual in this … Continue reading

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