Editable is an option for displayed objects, cells, and notebooks that specifies whether their contents can be edited interactively using the front end.

EditCellTagsSettings -> {opt_1 -> val_1, opt_2 -> val_2} is a global option that specifies settings for the Edit Cell Tags dialog box.

EffectiveInterest[r, q] gives the effective interest rate corresponding to interest specification r, compounded at time intervals q.

Eigensystem[m] gives a list {values, vectors} of the eigenvalues and eigenvectors of the square matrix m. Eigensystem[{m, a}] gives the generalized eigenvalues and ...

Eigenvalues[m] gives a list of the eigenvalues of the square matrix m. Eigenvalues[{m, a}] gives the generalized eigenvalues of m with respect to a. Eigenvalues[m, k] gives ...

EigenvectorCentrality[g] gives a list of eigenvector centralities for the vertices in the graph g.EigenvectorCentrality[g, "In"] gives a list of in-centralities for a ...

Eigenvectors[m] gives a list of the eigenvectors of the square matrix m. Eigenvectors[{m, a}] gives the generalized eigenvectors of m with respect to a. Eigenvectors[m, k] ...

ElementData["name", " property"] gives the value of the specified property for the chemical element " name".ElementData[n, " property"] gives the specified property for the ...

Element[x, dom] or x \[Element] dom asserts that x is an element of the domain dom. Element[{x_1, x_2, ...}, dom] asserts that all the x_i are elements of dom. Element[patt, ...

EllipticExp[u, {a, b}] is the inverse for EllipticLog. It produces a list {x, y} such that u == EllipticLog[{x, y}, {a, b}].