scholarly journals Bridging Semisymmetric and Half-Arc-Transitive Actions on Graphs

2002 ◽  
Vol 23 (6) ◽  
pp. 719-732 ◽  
Author(s):  
Dragan Marušič ◽  
Primož Potočnik
Keyword(s):  
Transitive Actions

scholarly journals Geometrically rational real conic bundles and very transitive actions

2010 ◽  
Vol 147 (1) ◽  
pp. 161-187 ◽  
Author(s):  
Jérémy Blanc ◽  
Frédéric Mangolte
Keyword(s):  
Automorphism Groups ◽  
Algebraic Surfaces ◽  
Algebraic Models ◽  
Transitive Automorphism ◽  
Real Locus ◽  
Real Algebraic Surfaces ◽  
Conic Bundles ◽  
Transitive Actions ◽  
Insight Into

AbstractIn this article we study the transitivity of the group of automorphisms of real algebraic surfaces. We characterize real algebraic surfaces with very transitive automorphism groups. We give applications to the classification of real algebraic models of compact surfaces: these applications yield new insight into the geometry of the real locus, proving several surprising facts on this geometry. This geometry can be thought of as a half-way point between the biregular and birational geometries.

scholarly journals Is children's acquisition of the passive a staged process? Evidence from six- and nine-year-olds' production of passives

2011 ◽  
Vol 39 (5) ◽  
pp. 991-1016 ◽  
Author(s):  
KATHERINE MESSENGER ◽  
HOLLY P. BRANIGAN ◽  
JANET F. McLEAN
Keyword(s):  
Syntactic Structure ◽  
Strong Tendency ◽  
Syntactic Priming ◽  
Thematic Roles ◽  
Thematic Role ◽  
Constituent Structure ◽  
Role Mapping ◽  
Transitive Actions

ABSTRACTWe report a syntactic priming experiment that examined whether children's acquisition of the passive is a staged process, with acquisition of constituent structure preceding acquisition of thematic role mappings. Six-year-olds and nine-year-olds described transitive actions after hearing active and passive prime descriptions involving the same or different thematic roles. Both groups showed a strong tendency to reuse in their own description the syntactic structure they had just heard, including well-formed passives after passive primes, irrespective of whether thematic roles were repeated between prime and target. However, following passive primes, six-year-olds but not nine-year-olds also produced reversed passives, with well-formed constituent structure but incorrect thematic role mappings. These results suggest that by six, children have mastered the constituent structure of the passive; however, they have not yet mastered the non-canonical thematic role mapping. By nine, children have mastered both the syntactic and thematic dimensions of this structure.

scholarly journals Equivariant Compactifications of Two-Dimensional Algebraic Groups

2014 ◽  
Vol 58 (1) ◽  
pp. 149-168 ◽  
Author(s):  
Ulrich Derenthal ◽  
Daniel Loughran
Keyword(s):  
Homogeneous Spaces ◽  
Algebraic Groups ◽  
Rational Points ◽  
Del Pezzo Surfaces ◽  
Direct Products ◽  
Two Dimensional ◽  
Del Pezzo ◽  
Manin’S Conjecture ◽  
Transitive Actions

AbstractWe classify generically transitive actions of semi-direct products on ℙ2. Motivated by the program to study the distribution of rational points on del Pezzo surfaces (Manin's conjecture), we determine all (possibly singular) del Pezzo surfaces that are equivariant compactifications of homogeneous spaces for semi-direct products .

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