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Thread: The mystery with infinity

  1. #1 The mystery with infinity 
    Forum Freshman
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    Here is a question
    what is
    [-infinity][infinity] = ?

    Is it not determined or [+infinity] or [-infinity] or simply 0 ?


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  3. #2  
    Forum Cosmic Wizard
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    The answer is indeterminate. It really has no meaning.


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  4. #3  
    Genius Duck Moderator Dywyddyr's Avatar
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  5. #4  
    Forum Radioactive Isotope MagiMaster's Avatar
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    In real arithmetic, infinity is not a number but a limit, so it would depend on how you reached that infinity (though it'll usually be negative). But it will never be zero because the only way for a * b to be 0 is if a or b is zero.
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  6. #5  
    Forum Radioactive Isotope sculptor's Avatar
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  7. #6  
    Forum Cosmic Wizard
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    The real projective line can be thought of as a line whose endpoints meet at infinity.





    Real projective line - Wikipedia, the free encyclopedia
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  8. #7  
    Forum Professor river_rat's Avatar
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    When people ask about arithmatic the standard response would be to look at the extended reals and follow the rules there. In this case, .

    Wiki is your friend here: Extended real number line - Wikipedia, the free encyclopedia
    As is often the case with technical subjects we are presented with an unfortunate choice: an explanation that is accurate but incomprehensible, or comprehensible but wrong.
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