Protected is an attribute which prevents any values associated with a symbol from being modified.

ReadProtected is an attribute that prevents values associated with a symbol from being seen.

Protect[s_1, s_2, ...] sets the attribute Protected for the symbols s_i. Protect["form_1", "form_2", ...] protects all symbols whose names match any of the string patterns ...

Locked is an attribute that, once assigned, prevents modification of any attributes of a symbol.

Unprotect[s_1, s_2, ...] removes the attribute Protected for the symbols s_i. Unprotect["form_1", "form_2", ...] unprotects all symbols whose names textually match any of the ...

Copyable is an option for Cell that specifies whether a cell can be copied interactively using the front end.

AbortProtect[expr] evaluates expr, saving any aborts until the evaluation is complete.

Definitions such as f[x_]=x^2 specify values for functions. Sometimes, however, you need to specify general properties of functions, without necessarily giving explicit ...

Any Mathematica symbol can have both a variety of types of values, and a variety of independently settable attributes that define overall aspects of its behavior.

Mathematica allows you to define transformation rules for any expression. You can define such rules not only for functions that you add to Mathematica, but also for intrinsic ...