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Use

command for making a ring active
Syntax 

Use N

where N is either the identifier of an existing ring or a ring
itself.

Description
This command makes a ring active, i.e. makes a ring the current ring. The command Use N ::= E; where E is a ring, is a shorthand for N ::= E; Use N;

If you want to change the ring inside a function you should call Using instead.

Example 
  Use S ::= QQ[x,y,z];
  RingEnv();
S
-------------------------------
  T ::= ZZ/(3)[a,b];
  Use T;
  RingEnv();
T
-------------------------------
  Use QQ[u];  -- note that "Use" can be used w/out a ring identifier
  RingEnv();
CurrentRingEnv
-------------------------------
  CurrentRing();
QQ[u]
-------------------------------


See Also