please help, i dont know how to post on latex, for example the attachment is on the link below but I dont know how to post on this message

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- Feb 16th 2009, 03:29 PMmancillaj3Least and greatest upper bound of a set
please help, i dont know how to post on latex, for example the attachment is on the link below but I dont know how to post on this message

- Feb 16th 2009, 03:52 PMReckoner
Just surround your $\displaystyle \text\LaTeX$ code with [tex] and [/tex]. The board sets math mode automatically, so don't use dollar signs around everything.

For example:

Code:`[tex]\sum_{n=1}^\infty\frac1n=\frac{\pi^2}6[/tex]`

$\displaystyle \sum_{n=1}^\infty\frac1{n^2}=\frac{\pi^2}6$

Use \text{} to get regular non-math text. There are limits on the number of characters and the size of each $\displaystyle \text\LaTeX$ image, so you may need to break things up into several sections. For full paragraphs of text, like in your PDF, post the non-math text outside of the [tex] tags. - Feb 16th 2009, 04:04 PMmancillaj3
Find the least upper bound and the greatest lower bound of the following sets. For a given $\displaystyle \epsilon$>0, find a number in the set that exceeds (l.u.b.A)-$\displaystyle \epsilon$ and a number in the set that is smaller than (g.l.b. A)+ $\displaystyle \epsilon$.

(a). A=$\displaystyle \lbrace

$$\displaystyle \frac{4+x}{x}$$\displaystyle \vert$x

$\displaystyle \geq$

1$\displaystyle \rbrace$ - Feb 16th 2009, 04:09 PMReckoner
- Feb 17th 2009, 03:47 AMmr fantastic
So, for the record, the actual question that the OP wants an answer for is:

Quote:

Find the least upper bound and the greatest lower bound of the following sets. For a given $\displaystyle \epsilon$>0, find a number in the set that exceeds (l.u.b.A)-$\displaystyle \epsilon$ and a number in the set that is smaller than (g.l.b. A)+ $\displaystyle \epsilon$.

$\displaystyle \text A=\left\{\left.\frac{4+x}x\;\right\vert\;x\geq1\ri ght\}$