CoCoA:RingEnvSet
From ApCoCoAWiki
RingEnvSet
set of names of the ring environments
Description
This function returns the list of the identifiers of the rings on
which the object E is dependent. Similar to <ttref>RingEnv</ttref>,
this function also works on lists and matrices and returns the set of ring environments of all entries. ...needless to say that it may be quite slow on big inputs!
Example
Use R ::= Q[x,y,z]; L1 := [x, y]; L2 := [x, y, 0, 5/4]; Use S ::= Z/(3)[a,b]; RingEnvSet(L1); [<coc_quotes>R</coc_quotes>] ------------------------------- RingEnvSet(L2); [<coc_quotes>R</coc_quotes>, <coc_quotes/>] ------------------------------- RingEnvSet([L2, a+b]); [<coc_quotes>R</coc_quotes>, <coc_quotes/>, <coc_quotes>S</coc_quotes>] -------------------------------
Syntax
RingEnvSet(E:LIST, MAT, POLY, IDEAL, MODULE, RATFUN, VECTOR):LIST of STRING
<type>ring</type>
