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Math Help - Its very Urgent please solve the problem

  1. #1
    msg
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    Its very Urgent please solve the problem

    Its very urgent please solve the attahed problems till 07-Dec-2007
    Thanking you.
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by msg View Post
    Its very urgent please solve the attahed problems till 07-Dec-2007
    Thanking you.
    How can it be that urgent if it isn't due for a whole month?

    -Dan
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  3. #3
    msg
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    Dear its really urgent wrongly written Dec. instead of Nov. in hurry

    You can imagine it how urgent it is. In hurry i wrongly write 07-Dec-2007 instead of 07-Nov-2007. Please don something i you can
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  4. #4
    Forum Admin topsquark's Avatar
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    What are the graphs for at the top? I can see no use in them.

    For 1, consider f: \mathbb{R} \to \mathbb{R}

    If this is one-to-one then every value of x in the domain produces a distinct value of f(x) in the range. As it is easy to see that f(-x) = f(x), this is not true, so the function is not one to one.

    For a function to be onto (ie. surjective) we must use all the values in the codomain (range). The span of the reals includes negative numbers. Can the function produce a negative number?

    2. R = {(2, 1), (3, 1), (3, 2), (4, 1), (4, 2), (4, 3)}
    I leave it to you to find the inverse relation.

    I'm sorry, I don't know what a directed graph is and have no time to look it up. A search on google should tell you the information you need.

    -Dan
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