A vetor-valued function f is never zero and has a derivative f'
which exists and is continuous on R. If there is a real function l
such that f'(t)=l(t)f(t) for all t, prove that there is a positive
real function u and a constant vector c such that f(t)=u(t)c for
all t.
想請問有沒有不需要用到微分方程的解法啊??
謝謝~~
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※ 編輯: bineapple 來自: 111.82.193.214 (11/09 07:09)