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- W2143703413 abstract "Alexander ( 1, 2 ) has introduced certain topological invariants of a manifold which arise from the intersections of cycles of non-complementary dimensions, and he points out that they are not derivable from the Betti and torsion numbers, nor from the fundamental group. In the present paper we consider some topological invariants of this type on an algebraic surface, and, although we cannot define them completely, we show that they are intimately connected with the multiplications of the period matrix of the simple integrals of the first kind. We are then led to a concept which we call the “intersection group” of the surface, which is, by its definition, topologically invariant, and we show that it is also invariant under birational transformations. The proofs are based on Lefschetz's theory of cycles for an algebraic surface (4) and some simple properties of the period matrix of an algebraic curve. The results obtained here have a number of applications to the theory of ∞ 3 correspondences between algebraic surfaces, as we propose to show in a later paper." @default.
- W2143703413 created "2016-06-24" @default.
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- W2143703413 date "1940-10-01" @default.
- W2143703413 modified "2023-09-25" @default.
- W2143703413 title "Invariant groups associated with an algebraic surface" @default.
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- W2143703413 doi "https://doi.org/10.1017/s030500410001745x" @default.
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