Encode["source", " dest"] writes an encoded version of the file source to the file dest. << dest decodes the file before reading its contents. Encode["source", " dest", " ...

EndPackage[] restores $Context and $ContextPath to their values before the preceding BeginPackage, and prepends the current context to the list $ContextPath.

Erosion[image, ker] gives the morphological erosion of image with respect to the structuring element ker.Erosion[image, r] gives the erosion with respect to a range-r square.

Evaluate[expr] causes expr to be evaluated even if it appears as the argument of a function whose attributes specify that it should be held unevaluated.

EvaluationObject[n, expr, ...] represents an expression submitted for evaluation on any available parallel kernel.

EvenQ[expr] gives True if expr is an even integer, and False otherwise.

Except[c] is a pattern object which represents any expression except one that matches c. Except[c, p] represents any expression that matches p but not c.

Exclusions is an option that specifies where to exclude in regions used by functions like Plot, Plot3D, and NIntegrate.

ExclusionsStyle is an option to plotting functions that specifies how to render subregions excluded according to Exclusions.

ExpandNumerator[expr] expands out products and powers that appear in the numerator of expr.