ErrorBox[boxes] is a low-level box construct that represents boxes that cannot be interpreted in input or output.
EstimatorGains[ss, {p_1, p_2, ..., p_n}] gives the estimator gain matrix for the StateSpaceModel object ss, such that the poles of the estimator are p_i.
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.
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.