Differences[list] gives the successive differences of elements in list. Differences[list, n] gives the n\[Null]^th differences of list. Differences[list, {n_1, n_2, ...}] ...
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 ...
ImageDeconvolve[image, ker] gives a deconvolution of image using kernel ker.
ListCorrelate[ker, list] forms the correlation of the kernel ker with list. ListCorrelate[ker, list, k] forms the cyclic correlation in which the k \[Null]^th element of ker ...
CoefficientList[poly, var] gives a list of coefficients of powers of var in poly, starting with power 0. CoefficientList[poly, {var_1, var_2, ...}] gives an array of ...
LinearRecurrence[ker, init, n] gives the sequence of length n obtained by iterating the linear recurrence with kernel ker starting with initial values ...
Names
(Built-in Mathematica Symbol) Names["string"] gives a list of the names of symbols which match the string. Names[patt] gives a list of names matching the arbitrary string pattern patt.
DiscreteConvolve[f, g, n, m] gives the convolution with respect to n of the expressions f and g. DiscreteConvolve[f, g, {n_1, n_2, ...}, {m_1, m_2, ...}] gives the ...
Partition[list, n] partitions list into non-overlapping sublists of length n. Partition[list, n, d] generates sublists with offset d. Partition[list, {n_1, n_2, ...}] ...
Dot
(Built-in Mathematica Symbol) a.b.c or Dot[a, b, c] gives products of vectors, matrices, and tensors.