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The connection Laplacian, also known as the rough Laplacian, is a differential operator acting on the various tensor bundles of a manifold, defined in terms of a Riemannian- or pseudo-Riemannian metric. When applied to functions (i.e. tensors of rank 0), the connection Laplacian is often called the Laplace–Beltrami operator.
As a second-order differential operator, the Laplace operator maps C k functions to C k−2 functions for k ≥ 2.It is a linear operator Δ : C k (R n) → C k−2 (R n), or more generally, an operator Δ : C k (Ω) → C k−2 (Ω) for any open set Ω ⊆ R n.
In mathematics, the discrete Laplace operator is an analog of the continuous Laplace operator, defined so that it has meaning on a graph or a discrete grid.For the case of a finite-dimensional graph (having a finite number of edges and vertices), the discrete Laplace operator is more commonly called the Laplacian matrix.
Green's second identity establishes a relationship between second and (the divergence of) first order derivatives of two scalar functions. In differential form p m Δ q m − q m Δ p m = ∇ ⋅ ( p m ∇ q m − q m ∇ p m ) , {\displaystyle p_{m}\,\Delta q_{m}-q_{m}\,\Delta p_{m}=\nabla \cdot \left(p_{m}\nabla q_{m}-q_{m}\,\nabla p_{m ...
The "geometer's" sign convention is used for the Hodge Laplacian here. In particular it has the opposite sign on functions as the usual Laplacian. Second fundamental form of an immersion
Let (t, ξ) be spherical coordinates on the sphere with respect to a particular point p of H n−1 (say, the center of the Poincaré disc). Here t represents the hyperbolic distance from p and ξ a parameter representing the choice of direction of the geodesic in S n−2. Then the hyperbolic Laplacian has the form:
where , and are 1D discrete Laplacians in every of the 3 directions, and are the identities of appropriate sizes. Each 1D discrete Laplacian must correspond to the case of the homogeneous Dirichlet boundary condition, in order to generate the 3D discrete Laplacian L corresponding to the homogeneous Dirichlet boundary condition everywhere on the boundary.
In Cartesian coordinates, the Laplacian of a function (,,) is = = = + +. The Laplacian is a measure of how much a function is changing over a small sphere centered at the point. When the Laplacian is equal to 0, the function is called a harmonic function .
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