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Thread: Maths symbol?

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    Cadet cloud edwards's Avatar
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    Maths symbol?

    Hey, attached is from a maths textbook. THere's this 'R' looking symbol that i haven't seen before. What does it mean and how is it typically used.

    Thanks
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    water enthusiast captainhelium's Avatar
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    Re: Maths symbol?

    I think that just means 'Real Numbers'.

    It's mainly just used as a restriction or as some extra info to a question I think such as saying that 'x' is/can only a real number.
    Last edited by captainhelium; 9 Feb 2018 at 12:35 AM.
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    Junior Member HeroWise's Avatar
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    Re: Maths symbol?

    IT means in reals, its just limiting the numbers in the real system aka not being able to take roots of imaginary
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    Re: Maths symbol?

    As everyone else said, it's set notation for all real numbers.

    Real numbers include integers, rationals and irrationals such as , but stop short of including imaginary numbers like .

    Sometimes it will be written , which means the same thing.

    Here are some other ones that you may encounter:

    (natural numbers)

    (integers)

    (rationals)

    (complex numbers)

    You can also add a superscripted sign to place further restrictions.

    e.g. means positive integers.
    Last edited by fan96; 9 Feb 2018 at 7:06 PM.
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    1(3√3) t2 dt cos(3π/9) = log(3√e) | Integral t2 dt, From 1 to the cube root of 3. Times the cosine, of three pi over nine, Equals log of the cube root of e.

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    Cadet cloud edwards's Avatar
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    Re: Maths symbol?

    Ohhh thanks
    Last edited by cloud edwards; 10 Feb 2018 at 7:38 PM.

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