→ RaichueRen :感謝! 10/22 13:46
※ 引述《RaichueRen (雷丘仁)》之銘言:
: 要如何證明,
: 一個定義在[0,1]的連續函數,
: 如果我們知道他所有在[0,1]上有理點的值
: (也就是[0,1]和Q的交集)
: 那麼就決定了唯一的函數
: 謝謝!
Q is dense on R
hence, every x in [0,1]
there is a rational seqence {n_k} approaching x
f(n_k) is known and f is continuous
then lim f(n_k) is determined.
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