what's the error I got here? why it is wrong? How should I make this right for post?

  • Hmm, I don't know. What a useless message. – halirutan Dec 3 at 10:26
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    However, if you wanted to post the question like this, it would have been closed because this is the site for the software Mathematica. Please ask purely math-related questions on math.stackexchange. – halirutan Dec 3 at 10:29
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    The problem may have been in the title. Common title problems are too short or already in use by another question. There would have been a floating explanatory message up by the title. – m_goldberg Dec 3 at 15:10

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