| #### 7.10.2.1 operatorAlgebra Procedure from library `fpalgebras.lib` (see fpalgebras_lib). Usage: operatorAlgebra(a,d); a a string, d an integer Return: ring Note: - the ring contains the ideal I, which contains the required relations - a gives the name of the algebra - d gives the degreebound for the Letterplace ring a must be one of the following: integrodiff3 toeplitz weyl1 usl2 usl2h shift1inverse exterior2 quadrowmm shift1 weyl1inverse This is a collection of common algebras. Example:
    LIB "fpalgebras.lib";
    def R = operatorAlgebra("integrodiff3",5); setring R;
    I; //relations of the algebra
    ==> I[1]=-x*D+D*x-1
    ==> I[2]=II*II-x*II+II*x
    ==> I[3]=D*II-1

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