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    • The Envelope Theorem

      The envelope theorem is a basic theorem used to solve maximization problems...'s lemma, Shephard's lemma, and Roy's identity. The statement of the theorem is: Consider an arbitrary maximization problem where...

    • than that of...& the one of .

      (1) The car of Mary is more expensive...這裡的the one of John是對的嗎?the one = the car 我知道這句可以寫成 The...用來避免重複. 與(2)的寫法不同之處在於the one為特定, one為不特定. 2013-01-17...

    • the below..= the following嗎?

      see the below email or see the following email...介系詞用 只有在口語上可當形容詞用, 例如: the below list, the below information, the below ...既然副詞與形容詞用法都普遍, 我再度強調the email below 與the below email都是ok的, 只是...