# Ring _ String -- get a ring variable by name

## Synopsis

• Operator: _
• Usage:
R_"x"
• Inputs:
• Outputs:
• , the variable of R whose name is x

## Description

 i1 : R = ZZ[x,y,z]; i2 : use R; i3 : S = ZZ[x,t]; i4 : x o4 = x o4 : S
The symbol x now refers to the variable x in the ring S. There are several ways of now referring to x in the ring R.
 i5 : R_0 o5 = x o5 : R i6 : R_"x" o6 = x o6 : R i7 : use R; i8 : x o8 = x o8 : R