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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,⩽) ...
by Mary Eagleson
Crystallographic symmetry operations Symmetry operation Symmetry element Hermann- Mauguin symbol || 2-fold rotation 3-fold rotation 4-fold rotation 6-fold rotation Inversion (reflection through a point) Reflection 3-fold rotary inversion ...
Encyclopedia of toxicology (2005)
Dib-L] by Philip Wexler, Bruce D. Anderson
malate dehydrogenase (2–3-fold), phosphoglucose isomerase (2–3-fold), glutathione ...
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 ...
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.
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 ...
by Michael Allaby
3-fold (triad), 4-fold (tetrad), and 6 -fold (hexad) axes. The centre of symmetry is a central point which is present when all faces or edges occur in parallel pairs on opposite sides of the crystal.
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