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Math Help - tilde symbol under a variable

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    tilde symbol under a variable

    how do i "underline" x with a tilde (the ~ symbol)?
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    Re: tilde symbol under a variable

    Quote Originally Posted by wik_chick88 View Post
    how do i "underline" x with a tilde (the ~ symbol)?
    Don't know what you want, but:
    [TEX]\underline{~x}[/TEX] or [TEX]\underline{\~x}[/TEX] or [TEX]\underline{\sim x}[/TEX] gives
    \underline{~x} or \underline{\~x} or \underline{\sim x}
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    Re: tilde symbol under a variable

    sorry, i realise how i worded it wrong. i want to put the ~ symbol underneath the x rather than on top of it
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    Re: tilde symbol under a variable

    Quote Originally Posted by wik_chick88 View Post
    sorry, i realise how i worded it wrong. i want to put the ~ symbol underneath the x rather than on top of it
    The tilde is placed on top of a symbol to indicate some special property. Why would you want to place it below a symbol?
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    Re: tilde symbol under a variable

    well i want to specify that x is a vector. sometimes in my notes it has the ~ symbol underneath it, sometimes it is in bold (which i don't know how to do either)
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    Re: tilde symbol under a variable

    Quote Originally Posted by wik_chick88 View Post
    well i want to specify that x is a vector. sometimes in my notes it has the ~ symbol underneath it, sometimes it is in bold (which i don't know how to do either)
    The usual way to denote a vector v is \vec v, which yields \vec{v}.
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    Re: tilde symbol under a variable

    Quote Originally Posted by wik_chick88 View Post
    sorry, i realise how i worded it wrong. i want to put the ~ symbol underneath the x rather than on top of it
    [TEX]\mathop x\limits_ \sim [/TEX] gives \mathop x\limits_ \sim
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    Re: tilde symbol under a variable

    Quote Originally Posted by wik_chick88 View Post
    how do i "underline" x with a tilde (the ~ symbol)?
    This is not easy in TeX. Part of the problem is that the tilde is a reserved character in TeX, which means that it is very hard to display it (except through the \tilde command, which produces an accent above a letter). The only way I can get it to appear underneath a character is to use Plato's idea in the previous comment, which produces something similar to a tilde by using the \sim symbol. The difficulty then is to get it to appear under an x, without raising the x, and without looking too big or too far underneath the x. The best I can manage is

    [TEX]a \underset{^\sim}x b[/TEX]

    which produces

    a \underset{^\sim}x b.

    Even then, the tilde is a long way below the x. I think you would probably do better to use an alternative notation.
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    Re: tilde symbol under a variable

    Quote Originally Posted by wik_chick88 View Post
    well i want to specify that x is a vector. sometimes in my notes it has the ~ symbol underneath it, sometimes it is in bold (which i don't know how to do either)
    Such notations are to denote a bold character in hand written material, more usual is an underscore. If you are setting stuff in LaTeX just make it bold.

    CB
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    Re: tilde symbol under a variable

    Quote Originally Posted by CaptainBlack View Post
    Such notations are to denote a bold character in hand written material, more usual is an underscore. If you are setting stuff in LaTeX just make it bold.

    CB
    Which you can do on this forum by doing

    [TEX]\mathbf{x}[/TEX], which renders

    \mathbf{x}.
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