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Math Help - Quick question about a symbol

  1. #1
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    Quick question about a symbol

    What does this symbol mean in mathematics?



    I've been searching but cannot find a definition for it yet.

    I was trying to answer this question:

    Using exactly two 2s and any of the standard mathematical symbols, write down an expression whose value is five.
    Solution:
    .2-2, which shows that two twos can make five!
    Is there some trick I'm not seeing?
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  2. #2
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    Quote Originally Posted by aquajam View Post
    What does this symbol mean in mathematics?
    This is a odd question. All I see is: \mathop O\limits^{..} .
    I have never seen that use in a standard way.
    Your text material should define its use.

    A really really old use of \mathop y\limits^{..} is the second derivative of y.
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  3. #3
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    Quote Originally Posted by Plato View Post
    This is a odd question. All I see is: \mathop O\limits^{..} .
    That's how it appears in the book. It's a math puzzle book rather than a textbook so it does not elaborate.

    An odd typo perhaps? Any ideas how you would solve the question anyway?
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  4. #4
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    Quote Originally Posted by aquajam View Post
    What does this symbol mean in mathematics?

    I think it's a typo: someone was trying to produce a square root symbol on their keyboard, and it came out as a capital O umlaut. Also, the 2 should be an exponent.

    In fact, \bigl(\sqrt{.2}\bigr)^{-2} = 5.
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  5. #5
    Super Member Quacky's Avatar
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    Lol, what a funny mistake
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