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  2. Fractional ideal - Wikipedia

    en.wikipedia.org/wiki/Fractional_ideal

    A fractional ideal of is an - submodule of such that there exists a non-zero such that . The element can be thought of as clearing out the denominators in , hence the name fractional ideal. The principal fractional ideals are those -submodules of generated by a single nonzero element of .

  3. Principal axis theorem - Wikipedia

    en.wikipedia.org/wiki/Principal_axis_theorem

    Mathematically, the principal axis theorem is a generalization of the method of completing the square from elementary algebra. In linear algebra and functional analysis, the principal axis theorem is a geometrical counterpart of the spectral theorem. It has applications to the statistics of principal components analysis and the singular value ...

  4. Principal ideal - Wikipedia

    en.wikipedia.org/wiki/Principal_ideal

    Principal ideal. In mathematics, specifically ring theory, a principal ideal is an ideal in a ring that is generated by a single element of through multiplication by every element of The term also has another, similar meaning in order theory, where it refers to an (order) ideal in a poset generated by a single element which is to say the set of ...

  5. Smith normal form - Wikipedia

    en.wikipedia.org/wiki/Smith_normal_form

    Smith normal form. In mathematics, the Smith normal form (sometimes abbreviated SNF [1]) is a normal form that can be defined for any matrix (not necessarily square) with entries in a principal ideal domain (PID). The Smith normal form of a matrix is diagonal, and can be obtained from the original matrix by multiplying on the left and right by ...

  6. Principal curvature - Wikipedia

    en.wikipedia.org/wiki/Principal_curvature

    The principal curvatures are the eigenvalues of the matrix of the second fundamental form in an orthonormal basis of the tangent space. The principal directions are the corresponding eigenvectors. Similarly, if M is a hypersurface in a Riemannian manifold N, then the principal curvatures are the eigenvalues of its second-fundamental form.

  7. Principal ideal domain - Wikipedia

    en.wikipedia.org/wiki/Principal_ideal_domain

    Principal ideal domain. In mathematics, a principal ideal domain, or PID, is an integral domain in which every ideal is principal, i.e., can be generated by a single element. More generally, a principal ideal ring is a nonzero commutative ring whose ideals are principal, although some authors (e.g., Bourbaki) refer to PIDs as principal rings.

  8. Principal bundle - Wikipedia

    en.wikipedia.org/wiki/Principal_bundle

    Formal definition. A principal -bundle, where denotes any topological group, is a fiber bundle: together with a continuous right action such that preserves the fibers of (i.e. if then for all ) and acts freely and transitively (meaning each fiber is a G-torsor) on them in such a way that for each and , the map sending to is a homeomorphism.

  9. Principal ideal ring - Wikipedia

    en.wikipedia.org/wiki/Principal_ideal_ring

    In mathematics, a principal right (left) ideal ring is a ring R in which every right (left) ideal is of the form xR ( Rx) for some element x of R. (The right and left ideals of this form, generated by one element, are called principal ideals .) When this is satisfied for both left and right ideals, such as the case when R is a commutative ring ...

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