In mathematics, the Porteous formula, or Thom–Porteous formula, or Giambelli–Thom–Porteous formula, is an expression for the fundamental class of a degeneracy locus (or determinantal variety) of a morphism of vector bundles in terms of Chern classes. Giambelli's formula is roughly the special case when the vector bundles are sums of line bundles over projective space. Thom pointed out that the fundamental class must be a polynomial in the Chern classes and found this polynomial in a few special cases, and Porteous found the polynomial in general. proved a more general version, and generalized it further.
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| - Fórmula de Porteous (es)
- Porteous formula (en)
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| - En matemática, la fórmula de Porteus, introducida por Porteous (1971), es una expresión para la clases fundamental de una variedad de determinantes en términos de clases de Chern. & (1974) han proveído una versión más general. (es)
- In mathematics, the Porteous formula, or Thom–Porteous formula, or Giambelli–Thom–Porteous formula, is an expression for the fundamental class of a degeneracy locus (or determinantal variety) of a morphism of vector bundles in terms of Chern classes. Giambelli's formula is roughly the special case when the vector bundles are sums of line bundles over projective space. Thom pointed out that the fundamental class must be a polynomial in the Chern classes and found this polynomial in a few special cases, and Porteous found the polynomial in general. proved a more general version, and generalized it further. (en)
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| - En matemática, la fórmula de Porteus, introducida por Porteous (1971), es una expresión para la clases fundamental de una variedad de determinantes en términos de clases de Chern. & (1974) han proveído una versión más general. (es)
- In mathematics, the Porteous formula, or Thom–Porteous formula, or Giambelli–Thom–Porteous formula, is an expression for the fundamental class of a degeneracy locus (or determinantal variety) of a morphism of vector bundles in terms of Chern classes. Giambelli's formula is roughly the special case when the vector bundles are sums of line bundles over projective space. Thom pointed out that the fundamental class must be a polynomial in the Chern classes and found this polynomial in a few special cases, and Porteous found the polynomial in general. proved a more general version, and generalized it further. (en)
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