EulerGamma is Euler's constant \[Gamma], with numerical value \[TildeEqual] 0.577216.
EulerianGraphQ[g] yields True if the graph g is Eulerian, and False otherwise.
EulerPhi[n] gives the Euler totient function \[Phi](n).
Evaluatable is an option for Cell that specifies whether a cell should be used as input to be evaluated by the Mathematica kernel.
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.
EvaluatePacket[expr] is a MathLink packet requesting evaluation of expr.
EvaluationCompletionAction is an option for notebooks that specifies the action taken when an evaluation is completed.
EvaluationElements is an option for NotebookEvaluate that determines which cells to evaluate.
EvaluationMonitor is an option for various numerical computation and plotting functions that gives an expression to evaluate whenever functions derived from the input are ...
EvaluationNotebook[] gives the notebook in which this function is being evaluated.