Integral equation - Wikipedia
https://en.wikipedia.org/wiki/Integral_equationIntegral equations as a generalization of eigenvalue equations. Certain homogeneous linear integral equations can be viewed as the continuum limit of eigenvalue equations.Using index notation, an eigenvalue equation can be written as , = where M = [M i,j] is a matrix, v is one of its eigenvectors, and λ is the associated eigenvalue.. Taking the continuum limit, i.e., replacing the …
Singular integral - Wikipedia
https://en.wikipedia.org/wiki/Singular_integralIn mathematics, singular integrals are central to harmonic analysis and are intimately connected with the study of partial differential equations. Broadly speaking a singular integral is an integral operatorwhose kernel function K : R ×R → R is singularalong the diagonal x = y. Specifically, the singularity is such that |K(x, y)| is of size |x − y| asymptotically as |x − y| → 0. Since such integrals may not in general be absolutely integrable, a rigorous definition must define them as the limit of the integral …
Integral equation - Wikipedia
en.wikipedia.org › wiki › Integral_equationA nonlinear Volterra integral equation has the general form: φ ( x ) = f ( x ) + λ ∫ a x K ( x , t ) F ( x , t , φ ( t ) ) d t , {\displaystyle \varphi (x)=f (x)+\lambda \int _ {a}^ {x}K (x,t)\,F (x,t,\varphi (t))\,dt,} where F is a known function.
Singular integral - Wikipedia
en.wikipedia.org › wiki › Singular_integralT is said to be a singular integral operator of non-convolution type associated to the Calderón–Zygmund kernel K if. ∫ g ( x ) T ( f ) ( x ) d x = ∬ g ( x ) K ( x , y ) f ( y ) d y d x , {\displaystyle \int g (x)T (f) (x)\,dx=\iint g (x)K (x,y)f (y)\,dy\,dx,} whenever f and g are smooth and have disjoint support.