[代數] 有關 Cyclotomic polynomial 的問題
(Def)
Let zeta_n = exp(i 2pi/n), n-root of unity
Let Phi_n(x) be the minimum poly of zeta_n over Q
(Problem) Prove or disprove:
Let g(x) in Z[x], deg(g) = n-1, with all coefficient nonnegative, n > 1.
If g(zeta_n) = 0, then g(x) have periodic coefficient,
which means g(x) = h(x) (1 + x^T + ... x^(kT)) for some k, T in N.
Ex: Write (a_0, a_1, a_2, ...) instead of a_0 + a_1 x + a_2 x^2 + ...
n = 6, g(x) = (1,2,3,1,2,3), g(zeta_6) = 0
(Remark) This problem holds for p-power n = p^c,
since Phi_n(x) is of degree p^(c-1) (p-1)
and already periodic with T = p^(c-1)
(In fact, Phi_n(x) = 1 + x^T + ... + x^((p-1)T). )
For n not p-power, Phi_n(x) would have negative coefficient.
Note that Phi_n(1) = 1 in this case.
沒什麼頭緒qw q
這個問題是在研究矩陣 M =
[ a1 a2 a3 ... an ]
[ an a1 a2 ... an-1 ]
[ an-1 an a1 ... an-2 ]
[ ...
[ a2 a3 a4 ... a1 ]
的時候出現的, all ai nonnegative
M 的特徵值是 a1 + a2 zeta_n^k + ... an zeta_n^(k(n-1))
k = 0, 1, ..., n-1
我想知道 det(M) 什麼時候不是 0
懷疑就是 ai not periodic 的時候 但做不出來ow o
畢竟 periodic 的時候明顯 det(M) = 0
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