13,609 research outputs found
Integration of Lie Algebroid Comorphisms
We show that the path construction integration of Lie algebroids by Lie
groupoids is an actual equivalence from the category of integrable Lie
algebroids and complete Lie algebroid comorphisms to the category of source
1-connected Lie groupoids and Lie groupoid comorphisms. This allows us to
construct an actual symplectization functor in Poisson geometry. We include
examples to show that the integrability of comorphisms and Poisson maps may not
hold in the absence of a completeness assumption.Comment: 28 pages, references adde
Symplectic Microgeometry III: Monoids
We show that the category of Poisson manifolds and Poisson maps, the category
of symplectic microgroupoids and lagrangian submicrogroupoids (as morphisms),
and the category of monoids and monoid morphisms in the microsymplectic
category are equivalent symmetric monoidal categories.Comment: 19 pages, 2 figure
Chromatographic test facility. Analysis and design of a capsule landing system and surface vehicle control system for Mars exploration
Test facility to verify design concepts and mathematical models of chromatograph for atmospheric composition analysis of Mar
Specialization of the rostral prefrontal cortex for distinct analogy processes
Analogical reasoning is central to learning and abstract thinking. It involves using a more familiar situation (source) to make inferences about a less familiar situation (target). According to the predominant cognitive models, analogical reasoning includes 1) generation of structured mental representations and 2) mapping based on structural similarities between them. This study used functional magnetic resonance imaging to specify the role of rostral prefrontal cortex (PFC) in these distinct processes. An experimental paradigm was designed that enabled differentiation between these processes, by temporal separation of the presentation of the source and the target. Within rostral PFC, a lateral subregion was activated by analogy task both during study of the source (before the source could be compared with a target) and when the target appeared. This may suggest that this subregion supports fundamental analogy processes such as generating structured representations of stimuli but is not specific to one particular processing stage. By contrast, a dorsomedial subregion of rostral PFC showed an interaction between task (analogy vs. control) and period (more activated when the target appeared). We propose that this region is involved in comparison or mapping processes. These results add to the growing evidence for functional differentiation between rostral PFC subregions
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