ImageTransformation[image, function] gives an image in which each pixel at position {x, y} corresponds to the position function[{x, y}] in image.ImageTransformation[image, ...
IncidenceMatrix[g] gives the vertex-edge incidence matrix of the graph g.
IndependentEdgeSetQ[g, elist] yields True if the edge list elist is an independent edge set of the graph g, and False otherwise.
Indeterminate is a symbol that represents a numerical quantity whose magnitude cannot be determined.
Information[symbol] prints information about a symbol.
InterpolatingFunction[domain, table] represents an approximate function whose values are found by interpolation.
ItemStyle is an option for Grid, Column, and related constructs that specifies styles to use for items.
JacobiAmplitude[u, m] gives the amplitude am(u \[VerticalSeparator] m) for Jacobi elliptic functions.
JacobiNC[u, m] gives the Jacobi elliptic function nc(u | m).
KirchhoffMatrix[g] gives the Kirchhoff matrix of the graph g.