A proof of the compactness theorem for arithmetical classes
H. Rasiowa (1952)
Fundamenta Mathematicae
Similarity:
H. Rasiowa (1952)
Fundamenta Mathematicae
Similarity:
Stanislav Jendroľ (1986)
Mathematica Slovaca
Similarity:
Karol Borsuk (1949)
Fundamenta Mathematicae
Similarity:
Wilfred Kaplan (1938)
Compositio Mathematica
Similarity:
Jiří Beneš (1984)
Kybernetika
Similarity:
Stanislav Jendroľ (1983)
Mathematica Slovaca
Similarity:
Dušan Repovš, Arkady Skopenkov (2000)
Colloquium Mathematicae
Similarity:
Suppose that P is a finite 2-polyhedron. We prove that there exists a PL surjective map f:Q → P from a fake surface Q with preimages of f either points or arcs or 2-disks. This yields a reduction of the Whitehead asphericity conjecture (which asserts that every subpolyhedron of an aspherical 2-polyhedron is also aspherical) to the case of fake surfaces. Moreover, if the set of points of P having a neighbourhood homeomorphic to the 2-disk is a disjoint union of open 2-disks, and every...