Cutting and pasting involutions
نویسندگان
چکیده
منابع مشابه
Cutting and pasting in the Torelli group
We introduce machinery to allow “cut-and-paste”-style inductive arguments in the Torelli subgroup of the mapping class group. In the past these arguments have been problematic because restricting the Torelli group to subsurfaces gives different groups depending on how the subsurfaces are embedded. We define a category TSur whose objects are surfaces together with a decoration restricting how th...
متن کاملCutting and Pasting in the Torelli Groups
We introduce machinery to allow “cut-and-paste”-style inductive arguments in the Torelli subgroups of the mapping class groups. In the past these arguments have been problematic because restricting the Torelli groups to subsurfaces gives different groups depending on how the subsurfaces are embedded. We define a category TSur whose objects are surfaces together with a decoration restricting how...
متن کاملCutting, pasting and painting: experimental embryology and neural development.
Through the use of the techniques of experimental embryology, developed by such pioneering artisans as Wilhelm Roux, Hans Spemann, Ross Harrison, Frank Lillie and Viktor Hamburger, as well as their scientific ‘children’, ‘grandchildren’ and more distant ‘relatives’, key principles of neural development have been elucidated (TIMELINE). Although the goal of experimental embryology seems rather si...
متن کاملPasting pseudofunctors
We give an abstract criterion for pasting pseudofunctors on two subcategories of a category into a pseudofunctor on the whole category. As an application we extend the variance theory of the twisted inverse image (−)! over schemes to that over formal schemes. Thus we show that over composites of compactifiable maps of noetherian formal schemes, there is a pseudofunctor (−)! such that if f is a ...
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ژورنال
عنوان ژورنال: Rocky Mountain Journal of Mathematics
سال: 1982
ISSN: 0035-7596
DOI: 10.1216/rmj-1982-12-2-233