Families in flats.
نویسندگان
چکیده
منابع مشابه
Flats in 3-manifolds
— We prove that if a closed aspherical Riemannian 3-manifold M contains a 2-flat, then there exists a free abelian subgroup of rank two in π1(M). Under some restrictions on the topology of M we prove the existence of an immersed incompressible flat torus in M . This generalizes results which were previously known for manifolds of nonpositive curvature. RÉSUMÉ. — Nous prouvons que si une variété...
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What is the subject here? The aim is to gain control of this medium, mostly so as to be able to make those faces, my main proving ground. And the medium itself —is what? Clearly it involves folding curves (in, as it happens, rectangles of brown wrapping paper sprayglued to thick aluminum foil). Now curve-folding, as is known, creates surfaces that won’t lie flush to each other, or “open folds”;...
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ژورنال
عنوان ژورنال: BMJ
سال: 1968
ISSN: 0959-8138,1468-5833
DOI: 10.1136/bmj.1.5590.516