[分析] 應該是和隱函數定理有關的題目..
P(x)是一個多項式
如果實數x'滿足 P(x)=(x-x')Q(x), Q(x')≠0
就稱x'是 P(x)的一個single root
Let P_t (x) = a_0(t) + a_1(t)*x + a_2(t)*x^2 +...+ a_n(t)*x^n
∞
其中 a_i(t)在實數上無窮可導, i=1,2,..,n (i.e. a_i(t)屬於C )
如果對某個實數t' 存在實數x' 且x'是 P_t' (x) 的single root
Is it ture that P_t (x) has the single root on an neighborhood of t' ?
(i.e. 存在區間(a,b), t'屬於(a,b),
使得對任意的t屬於(a,b) P_t(x) has the single root? )
做不出來 希望高手可以指點 謝謝
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