groebner基计算时，含有a1，a2,a3,...,an个自变量的非线性方程组问题化简问题
a1*a2+2*a1*a3+a2*a3=0a1^2+a1*a2+a2^2+a2*a3+a3^2=1/4;
a1+a2+a3=1
用with（Groebner）；
然后输入
x := seq(a, k = 0 .. n)
Basis(pl1, plex(x));
%;
Error, too many levels of recursion
Basis(pl1, prod(x));
%;
Error, too many levels of recursion
然后显示错误求高手指点，我做的东西最好用a1,a2,...,an这样设置未知数我好编程
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