/* presentation on standard generators for Fi22 */ PresentationFi22 := function (G : UserGenerators := [], Projective := false) Fct := Projective select ProjectiveOrder else Order; if #UserGenerators eq 0 then UserGenerators := [G.i : i in [1..Ngens (G)]]; end if; if #UserGenerators ne 2 then "Require 2 user generators"; return false; end if; a := UserGenerators[1]; b := UserGenerators[2]; return Fct (a) eq 2 and Fct (b) eq 13 and Fct (a*b) eq 11 and Fct (a*b^2) eq 21 and Fct ((a,b)) eq 3 and Fct ((a,b^2)) eq 3 and Fct ((a,b^3)) eq 3 and Fct ((a,b^4)) eq 2 and Fct ((a,b^5)) eq 3 and Fct ((a,b*a*b^2)) eq 3 and Fct ((a,b^-1*a*b^-2)) eq 2 and Fct ((a,b*a*b^5)) eq 2 and Fct ((a,b^2*a*b^5)) eq 2; end function;