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3-fold: In algebraic geometry, a 3-fold or threefold is a 3-dimensional algebraic variety.
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Topology and Geometry (2002)
Commemorating SISTAG : Singapore International Symposium in Topology and Geometry, (SISTAG) July 2-6, 2001, National University of Singapore, Singapore by A. Jon Berrick, Man Chun Leung, Xingwang Xu
and generalises them to indecomposable Gorenstein Fano 3-folds (see below for explanation). DEFINITION 2.1. A nonsingular Fano 3-fold is a nonsingular irreducible projective variety of dimension 3 with ample –Ky. Likewise, a Gorenstein ...
A Collection of Papers Honoring F.W. Gehring by Peter Duren, Juha Heinonen, Brad Osgood, Bruce Palka
hyperbolic 3-fold is a topological invariant. Because...
by Dominic D. Joyce, Yinan Song
4, a Calabi–Yau 3-fold is a smooth projective 3-fold X over K, with trivial canonical bundle KX. Fix a very ample line bundle OX (1) on X, and let (τ, G,⩽) ...
Lectures on Geometry (2017)
by Edward Witten, Martin Bridson, Helmut Hofer, Marc Lackenby, Rahul Pandharipande
Calabi–Yau 3-folds A Calabi–Yau 3-fold is a non-singular projective variety1 X of dimension 3 with trivial first Chern class ∧3TX ∼= OX. Often the triviality of ...
Encyclopedia of toxicology (2005)
Dib-L] by Philip Wexler, Bruce D. Anderson
malate dehydrogenase (2–3-fold), phosphoglucose isomerase (2–3-fold), glutathione ...
by S.E. Stiegeler
triad (3-fold), tetrad (4-fold), and hexad (6fold ) axes respectively (fig. 2). 3. centre of symmetry—a central point about which every face and edge of a crystal is matched by one parallel to it on the opposite ...
Structure and Characterization of Polycrystalline Materials by Vladimir Novikov
two perpendicular mirror planes; tetragonal, a single 4-fold axis or a rotationinversion axis; rhombohedral, a single 3-fold axis or a rotation-inversion axis; hexagonal, a single 6-fold axis or a rotation-inversion axis; and cubic, four 3 -fold axes.
Encyclopedia of Cancer (2011)
by Manfred Schwab
5- to 3-fold in overweight and obese individuals. The > incidence rates of adenocarcinoma of the esophagus and gastric cardia have been rapidly increasing in developed countries over the last ...
by Jacqueline Smith
triad hexadaxisofrotationsymmetry (3-fold), tetrad(4-fold), and hexad (6-fold) planesof Fig.1 axes respectively(fig.2). 3.center of sym- symmetry Fig.2 metry – a central point aboutwhichevery ...
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