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For a Calabi-Yau manifold X the following proposition shows that if X admits a ‘special’ K¨ahler form in the sense that the top power of any harmonic (1, 1)-form is harmonic, then X
Consider the case when V is locally finitely presentable as a closed category in the sense of [Kel82-2], and Φ is the class of finite weights as described there; this includes the
the pure, complete spread (with locally connected domain) factorization is ‘comprehen- sive’ in the sense of [12], (associated with a comprehension scheme [8]) with respect
In the previous section we gave a characterization of those (cartesian) bicategories of the form Span E for a category E with finite limits. In this final section we give a
should preserve finite products (including the empty product 1; thus a geometric morphism satisfying this condition is connected as well as locally connected), and (b) that
A straightforward verification shows that X is a countable locally finite ot- subset of the plane, and we are going to demonstrate that X is maximal.. In other words, we have
For a locally compact (not necessarily Hausdorff) groupoid endowed with pre-Haar systems (in the sense of [ 1 ] adapted to non-Hausdorff case) we prove that the space of
For a locally compact (not necessarily Hausdorff) groupoid endowed with pre-Haar systems (in the sense of [ 1 ] adapted to non-Hausdorff case) we prove that the space of
