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Math Help - Multiple of Infinity

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    Multiple of Infinity

    What would infinity multiplied by minus 1 be?
    Not sure if it would be infinity or minus infinity.

    Sorry if this is the wrong part of the forum.
    Last edited by drLef; February 26th 2009 at 11:08 AM.
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    Quote Originally Posted by drLef View Post
    What would infinity multiplied by minus 1 be?
    Not sure if it would be infinity or minus infinity.

    Sorry if this is the wrong part of the forum.
    If you are talking about ordinary operations on numbers, infinity is not a "number" and so "infinity multiplied by negative 1" (not "minus" 1) is not anything- it has no meaning. There are ways of defining systems that include "infinity" and "negative infinity" and in some of those, yes, "infinity multiplied by negative 1" is "negative infinity".
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    Quote Originally Posted by drLef View Post
    What would infinity multiplied by minus 1 be?
    Not sure if it would be infinity or minus infinity.

    Sorry if this is the wrong part of the forum.
    You can abuse this meaningless statement to work with limits.
    If a function has infinite limit then negative of the function has negative infinite limit.
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