maintains expr in an unevaluated form.
- Hold has attribute HoldAll, and performs no operation on its arguments.
- Hold is removed by ReleaseHold. »
- Hold[e1, e2, ...] maintains a sequence of unevaluated expressions to which a function can be applied using Apply.
- Even though expr itself is not evaluated, Hold[expr] may still evaluate if expr is of the form , and upvalues for f have been defined. »
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