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7.7.8.0. crystallographicGroupP6MM
Procedure from library fpalgebras.lib (see fpalgebras_lib).

Usage:
crystallographicGroupP6MM(d); d an integer

Return:
ring

Note:
- the ring contains the ideal I, which contains the required relations - p6mm group with the following presentation
< x, y, r, m | [x, y] = r^6 = m^2 = 1, r^-1*y*r = x^-1*y, r^-1*x*r = y, m^-1*x*m = x^-1, m^-1*y*m = x^-1*y, m^-1*r*m = r^-1*y> - d gives the degreebound for the Letterplace ring

Example:
 
LIB "fpalgebras.lib";
def R = crystallographicGroupP6MM(7); setring R;
I;
==> I[1]=x(1)*y(2)+y(1)*x(2)+1
==> I[2]=r(1)*r(2)*r(3)*r(4)*r(5)*r(6)+x(1)*y(2)+y(1)*x(2)
==> I[3]=r(1)*r(2)*r(3)*r(4)*r(5)*r(6)+1
==> I[4]=x(1)*y(2)+y(1)*x(2)+m(1)*m(2)
==> I[5]=r(1)*r(2)*r(3)*r(4)*r(5)*r(6)+m(1)*m(2)
==> I[6]=m(1)*m(2)+1
==> I[7]=m(1)*x(2)*m(3)+X(1)
==> I[8]=m(1)*y(2)*m(3)+X(1)*y(2)
==> I[9]=r(1)*r(2)*r(3)*r(4)*r(5)*x(6)*r(7)+y(1)
==> I[10]=r(1)*r(2)*r(3)*r(4)*r(5)*y(6)*r(7)+X(1)*y(2)
==> I[11]=r(1)*r(2)*r(3)*r(4)*r(5)*y(6)+m(1)*r(2)*m(3)
==> I[12]=X(1)*x(2)+1
==> I[13]=x(1)*X(2)+1
==> I[14]=Y(1)*y(2)+1
==> I[15]=y(1)*Y(2)+1


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