New-from-old full dualities via axiomatisation |
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Authors: | Brian A. Davey Jane G. Pitkethly Ross Willard |
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Affiliation: | 1. Department of Mathematics and Statistics, La Trobe University, Victoria 3086, Australia;2. Department of Pure Mathematics, University of Waterloo, Ontario N2L 3G1, Canada |
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Abstract: | We study different full dualities based on the same finite algebra. Our main theorem gives conditions on two different alter egos of a finite algebra under which, if one yields a full duality, then the other does too. We use this theorem to obtain a better understanding of several important examples from the theory of natural dualities. We also clarify what it means for two full dualities based on the same finite algebra to be different. Throughout the paper, a fundamental role is played by the universal Horn theory of the dual categories. |
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Keywords: | 08C20 08C15 03C07 Natural duality Full duality Alter ego Universal Horn axiomatisation |
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