Identity
Identity[expr_]
returns expr
.
Attributes[Identity] := {Protected}
Simple examples
In[1]:= Identity[5] Out[1]= 5
In[2]:= Identity[Identity[a]] Out[2]= a
Identity[expr_]
returns expr
.
Attributes[Identity] := {Protected}
In[1]:= Identity[5] Out[1]= 5
In[2]:= Identity[Identity[a]] Out[2]= a