Deformations of smooth toric surfacesmanuscripta mathematica - Tập 134 - Trang 123-137 - 2010
Nathan Owen Ilten
For a complete, smooth toric variety Y, we describe the graded vector space
$${T_Y^1}$$
. Furthermore, we show that smooth toric surfaces are unobstructed and that a smooth toric surface is rigid if and only if it is Fano. For a given toric surface we then construct homogeneous deformations by means of Mi...... hiện toàn bộ
Uniqueness of the inversive plane of order 7manuscripta mathematica - Tập 8 - Trang 21-26 - 1973
Ralph Hugh Francis Denniston
A search has shown that any inversive plane of order 7 must be isomorphic with the Miquelian plane. The method used was explicitly set out in a companion paper, which was concerned with a plane of order 5.
Adjunctions in monoidal categoriesmanuscripta mathematica - Tập 26 - Trang 123-139 - 1978
Harald Lindner
We consider the notion of an adjunction in a monoidal category. Whereas most of the theory of adjunctions in 2-categories carries over to this case, there are also some new phenomena specific to the monoidal case. The applications include some formal aspects in the Spanier-Whitehead duality of spectra as well as bilinear forms on modules.