DivisorSum[n, form] represents the sum of form[i] for all i that divide n.DivisorSum[n, form, cond] includes only those divisors for which cond[i] gives True.
FrameStyle is an option for Graphics, Grid, and other constructs that specifies the style in which to draw frames.
GaussianFilter[image, r] filters image by convolving with a Gaussian kernel of pixel radius r.GaussianFilter[image, r, {n_1, n_2}] convolves image with a kernel formed from ...
GradientFilter[image, r] gives an image corresponding to the magnitude of the gradient of image, computed using discrete derivatives of a Gaussian of pixel radius ...
InverseFourierCosTransform[expr, \[Omega], t] gives the symbolic inverse Fourier cosine transform of expr. InverseFourierCosTransform[expr, {\[Omega]_1, \[Omega]_2, \ ...}, ...
InverseFourierSinTransform[expr, \[Omega], t] gives the symbolic inverse Fourier sine transform of expr. InverseFourierSinTransform[expr, {\[Omega]_1, \[Omega]_2, \ ...}, ...
InverseJacobiCD[v, m] gives the inverse Jacobi elliptic function cd -1 (v \[VerticalSeparator] m).
InverseJacobiCN[v, m] gives the inverse Jacobi elliptic function cn -1 (v \[VerticalSeparator] m).
InverseJacobiCS[v, m] gives the inverse Jacobi elliptic function cs -1 (v \[VerticalSeparator] m).
InverseJacobiDN[v, m] gives the inverse Jacobi elliptic function dn -1 (v \[VerticalSeparator] m).