On the characterization of Jonsson-Tarski and of subtractive varieties
Marino Gran, Diana Rodelo (2012)
Diagrammes
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Marino Gran, Diana Rodelo (2012)
Diagrammes
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Marco Andreatta, Massimiliano Mella
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Antonio Lerario (2016)
Journal of the European Mathematical Society
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John T. Baldwin, Joel Berman (1976)
Colloquium Mathematicae
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G. Ewald (1988)
Discrete & computational geometry
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Weronika Buczyńska, Jaroslaw A. Wiśniewski (2007)
Journal of the European Mathematical Society
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We investigate projective varieties which are binary symmetric models of trivalent phylogenetic trees. We prove that they have Gorenstein terminal singularities and are Fano varieties of index 4 and dimension equal to the number of edges of the tree in question. Moreover any two such varieties which are of the same dimension are deformation equivalent, that is, they are in the same connected component of the Hilbert scheme of the projective space. As an application we provide a simple...
Misha Gromov (1999)
Journal of the European Mathematical Society
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The theorem of Ax says that any regular selfmapping of a complex algebraic variety is either surjective or non-injective; this property is called surjunctivity and investigated in the present paper in the category of proregular mappings of proalgebraic spaces. We show that such maps are surjunctive if they commute with sufficiently large automorphism groups. Of particular interest is the case of proalgebraic varieties over infinite graphs. The paper intends to bring out relations between...
Roberto Dvornicich (1980)
Acta Arithmetica
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B. Sturmfels, P. Kleinschmidt, J. Gretenkort (1990)
Discrete & computational geometry
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Magnus Steinby (2012)
Discussiones Mathematicae - General Algebra and Applications
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For a class of hypersubstitutions 𝓚, we define the 𝓚-solidity of general varieties of tree languages (GVTLs) that contain tree languages over all alphabets, general varieties of finite algebras (GVFAs), and general varieties of finite congruences (GVFCs). We show that if 𝓚 is a so-called category of substitutions, a GVTL is 𝓚-solid exactly in case the corresponding GVFA, or the corresponding GVFC, is 𝓚-solid. We establish the solidity status of several known GVTLs with respect to...
Kazuhisa Maehara (1983)
Mathematische Annalen
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Robin Hartshorne
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Stephan Fischli, David Yavin (1994)
Mathematische Zeitschrift
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V. B. Mehta, A. Ramanathan (1988)
Compositio Mathematica
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Paltin Ionescu (1985)
Mathematische Annalen
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