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  1. Simplifying von Plato's axiomatization of Constructive Apartness Geometry.Dafa Li, Peifa Jia & Xinxin Li - 2000 - Annals of Pure and Applied Logic 102 (1-2):1-26.
    In the 1920s Heyting attempted at axiomatizing constructive geometry. Recently, von Plato used different concepts to axiomatize it. He used 14 axioms to formulate constructive apartness geometry, seven of which have occurrences of negation. In this paper we show with the help of ANDP, a theorem prover based on natural deduction, that four new axioms without negation, shorter and more intuitive, can replace seven of von Plato's 14 ones. Thus we obtained a near negation-free new system consisting of 11 axioms.
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  • Using the prover ANDP to simplify orthogonality.Dafa Li - 2003 - Annals of Pure and Applied Logic 124 (1-3):49-70.
    In the 1920s, Heyting attempted at axiomatizing constructive geometry. Recently, von Plato used different concepts to axiomatize the geometry: he used 14 axioms to describe the axiomatization for apartness geometry. Then he added axioms A1 and A2 to his apartness geometry to get his affine geometry, then he added axioms O1, O2, O3 and O4 to the affine geometry to get orthogonality. In total, this gives 22 axioms. von Plato used four relations to describe the concept of orthogonality in O1, (...)
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  • A method for finding new sets of axioms for classes of semigroups.João Araújo & Janusz Konieczny - 2012 - Archive for Mathematical Logic 51 (5):461-474.
    We introduce a general technique for finding sets of axioms for a given class of semigroups. To illustrate the technique, we provide new sets of defining axioms for groups of exponent n, bands, and semilattices.
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