The Virtual Book is a browsable electronic collection of all the Mathematica tutorials, grouped according to functionality. It is an excellent place for users of all levels ...

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File inserts the contents of a file at the insertion point.

Magnification changes the display magnification for a notebook.

Operations opens a submenu to control grouping and graphic display placement.

AlgebraicNumberTrace[a] gives the trace of the algebraic number a.

ArrayDepth[expr] gives the depth to which expr is a full array, with all the parts at a particular level being lists of the same length, or is a SparseArray object.