This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
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yields an object that displays as the unevaluated form of expr, but which is evaluated if it is explicitly given as Mathematica input.
  • Defer[expr] returns an object which remains unchanged until it is explicitly supplied as Mathematica input, and evaluated using Shift+Enter, Evaluate in Place, etc.
  • Defer gives an object whose evaluation is merely deferred until it is explicitly given as Mathematica input; HoldForm gives an object that is never evaluated.
  • If an object contains several levels of nested Defer constructs, one level is removed each time the object is evaluated as Mathematica input.
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