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我會咁樣formulate個題目 given n, consider A=(Z_2)^n for (x1,...,xn), define s(x1,...,xn)=(xn,x1,...,x_{n-1}) （其實s只係permutation matrix) question: for which n, x+s(x)+s^2(x)+...=0 for all x? 諗到依度都係決定去訓:^(
我會咁樣formulate個題目 given n, consider A=(Z_2)^n for (x1,...,xn), define s(x1,...,xn)=(xn,x1,...,x_{n-1}) （其實s只係permutation matrix) question: for which n, x+s(x)+s^2(x)+...=0 for all x?