`sm1.restriction`

`sm1.restriction(``I`,`V`,`R`)-
:
It computes the restriction of
`I`as a D-module to the set defined by`R`.`V`is the list of variables. When the optional variable`degree`=d is given, only the restrictions from 0 to d are computed. Note that, in case of vector input, RESTRICTION VARIABLES MUST APPEAR FIRST in the list of variable`V`. We are using wbfRoots to get the roots of b-functions, so we can use only generic weight vector for now. `sm1.restriction(``I`,`V`,`R`|`degree`=key0)-
: This function allows optional variables
`degree`

Algorithm: T.Oaku and N.Takayama, math.AG/9805006, http://xxx.langl.gov

Example:

sm1.restriction([dx^2-x,dy^2-1],[x,y],[y]);

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