Difference between revisions of "CoCoA:Using"
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Latest revision as of 10:02, 24 October 2007
Using
perform commands in non-active ring
Description
Suppose S is the current ring and R is another ring, then
<verbatim>
Using R Do C; EndUsing;
</verbatim> is equivalent to <verbatim>
Use R; C; Use S;
</verbatim>
Example
Use S ::= Q[x,y]; -- the current ring is S R ::= Q[a,b,c]; -- another ring Using R Do Indets(); EndUsing; [a, b, c] -------------------------------
Note: Using Q[a,b] Do ... EndUsing; will produce an error: you need to name the polynomial ring.
Syntax
Using R Do C EndUsing where R is the identifier for a ring and C is a sequence of commands.
<type>ring</type>