[texhax] a question for logicians

[Steve Peter]

On May 2, 2008, at 10:41 AM, Alexandre Almeida wrote:

> There is a symbol that I don't know how to write it in Tex/laTex .I  
> saw lots os documents, websites, and none of them show this symbol.
>
> It is a triangle made of 3 points, instead of lines. In a logic  
> expression, it is used to give us the result.
> For exemplo if \exists ... therefore ...
>
> How can I write this symbol?

\usepackage{amssymb}

\therefore

Steve