A 3-dimensional absolute retract which does not contain any disk
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Caenorhabditis elegans DNA does not contain 5-methylcytosine at any time during development or aging.
DNA, isolated from age-synchronous senescent populations of Caenorhabditis elegans has been quantitatively and qualitatively analyzed for the presence of 5-methylcytosine. High performance liquid chromatography on two wild-type and several mutant strains of C. elegans failed to detect any 5-methylcytosine. The restriction endonuclease isoschizomers, HpaII and MspI, were used to digest genomic D...
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Definition. Suppose M is a noncompact manifold and N is a codimension 0 submanifold (with boundary). We say that N is a compact core of M if N is compact and the inclusion map N ↪→M is a homotopy equivalence. The question we address is this: If M is an n-dimensional noncompact PL manifold that has the homotopy type of a finite k-dimensional complex K, then must M contain a compact core? The ans...
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A computer calculation with Magma shows that there is no extremal self-dual binary code C of length 72 whose automorphism group contains the symmetric group of degree 3, the alternating group of degree 4 or the dihedral group of order 8. Combining this with the known results in the literature one obtains that Aut(C) has order at most 5 or is isomorphic to the elementary abelian group of order 8.
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Total subspaces in dual Banach spaces which are not norming over any infinite dimensional subspace Abstract. The main result: the dual of separable Banach space X contains a total subspace which is not norming over any infinite dimensional subspace of X if and only if X has a nonquasireflexive quotient space with the strictly singular quotient mapping. Let X be a Banach space and X * be its dua...
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ژورنال
عنوان ژورنال: Fundamenta Mathematicae
سال: 1964
ISSN: 0016-2736,1730-6329
DOI: 10.4064/fm-54-2-159-175