Remove (Built-in Mathematica Symbol)

Remove[symbol_1, ...] removes symbols completely, so that their names are no longer recognized by Mathematica. Remove["form_1", "form_2", ...] removes all symbols whose names ...

ClearAll (Built-in Mathematica Symbol)

ClearAll[symb_1, symb_2, ...] clears all values, definitions, attributes, messages, and defaults associated with symbols. ClearAll["form_1 ", "form_2", ...] clears all ...

OneIdentity (Built-in Mathematica Symbol)

OneIdentity is an attribute that can be assigned to a symbol f to indicate that f[x], f[f[x]], etc. are all equivalent to x for the purpose of pattern matching.

Options for Cells (Mathematica Tutorial)

Mathematica provides a large number of options for cells. All of these options can be accessed through the Option Inspector menu item in the front end. They can be set either ...

HoldRest (Built-in Mathematica Symbol)

HoldRest is an attribute which specifies that all but the first argument to a function are to be maintained in an unevaluated form.

HoldAllComplete (Built-in Mathematica Symbol)

HoldAllComplete is an attribute which specifies that all arguments to a function are not to be modified or looked at in any way in the process of evaluation.

SetOptions (Built-in Mathematica Symbol)

SetOptions[s, name_1 -> value_1, name_2 -> value_2, ...] sets the specified default options for a symbol s. SetOptions[stream, ...] or SetOptions["name", ...] sets options ...

SymbolName (Built-in Mathematica Symbol)

SymbolName[symbol] gives the name of the specified symbol.

Window Properties (Mathematica Guide)

Mathematica allows detailed control of the overall look and operation of notebook windows.

In (Built-in Mathematica Symbol)

In[n] is a global object that is assigned to have a delayed value of the n\[Null]^th input line.