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7.7.8.0. crystallographicGroupP4
Procedure from library fpalgebras.lib (see fpalgebras_lib).

Usage:
crystallographicGroupP4(d); d an integer

Return:
ring

Note:
- the ring contains the ideal I, which contains the required relations - p4 group with the following presentation
< x, y, r | [x, y] = r^4 = 1, r^-1*x*r = x^-1, r^-1*x*r = y > - d gives the degreebound for the Letterplace ring

Example:
 
LIB "fpalgebras.lib";
def R = crystallographicGroupP4(5); setring R;
I;
==> I[1]=x(1)*y(2)+y(1)*x(2)+1
==> I[2]=r(1)*r(2)*r(3)*r(4)+x(1)*y(2)+y(1)*x(2)
==> I[3]=r(1)*r(2)*r(3)*r(4)+1
==> I[4]=r(1)*r(2)*r(3)*x(4)*r(5)+X(1)
==> I[5]=r(1)*r(2)*r(3)*x(4)*r(5)+y(1)
==> I[6]=X(1)*x(2)+1
==> I[7]=x(1)*X(2)+1
==> I[8]=Y(1)*y(2)+1
==> I[9]=y(1)*Y(2)+1


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