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Math Help - 5i for any integer i?.. Huh?

  1. #1
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    Unhappy 5i for any integer i?.. Huh?

    I am studying set theory at uni coming from a background of no formal maths education. I am understanding the basics because it is just like doing running SQL against a database. It is the assumed knowledge that is my undoing.

    This is where I am currently getting stuck:
    A={n ∈ Z|m=5i-1, for some integer i}
    The bit that gets me is "m=5i-1". What do I do with the integer i?

    Does it mean I add i to 5 then take 1? Or do I make 5 to the power of i? Or do I multiply 5 by i?



    I am lost. Much thanks to anyone who can point me in the right direction.
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  2. #2
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    Quote Originally Posted by nasanu View Post
    This is where I am currently getting stuck:
    A={n ∈ Z|m=5i-1, for some integer i}
    The bit that gets me is "m=5i-1". What do I do with the integer i?
    Does it mean I add i to 5 then take 1? Or do I make 5 to the power of i? Or do I multiply 5 by i?
    You multiply 5 by i then subtract 1.
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  3. #3
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    Thank you

    I cant believe I've wasted so much time on something that simple
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