Using BIG Absolute Value Symbols in Tex

[mmm4444bot]

I think I allocated reasonable personal time searching arbitrary posts on this board to find an example of tex coding that produces large absolute value symbols as the outermost grouping symbols. I give up searching for now.

I know next to nothing about Tex, LaTex, AMSTex, AMSLaTex, LaDeeDahTex or any other XTexes. :?

Can someone please show me code that works properly to produce large absolute value symbols as the outermost grouping symbols at this message board?

My search discovered the following.

This code produces only the opening absolute value symbol; if I replace the parenthesis with an absolute value symbol, the result will not render anything.

\left| \frac{42}{1+x^4} \right)

\(\displaystyle \left| \frac{42}{1+x^4} \right)\)

The following code renders a large absolute value symbol after an expression, but it only works with the subscript expression _{} included. Additionally, if I replace the first . with |, then nothing will render.

\left. \frac{42}{1 + x^4} \right|_{.}

\(\displaystyle \left. \frac{42}{1 + x^4} \right|_{.}\)

Thanks in advance to anybody who replies ...

~ Mark

 

[Loren]

\left|\frac{42}{1+x^4}\right| yields

\(\displaystyle \left|\frac{42}{1+x^4}\right|\)

No spaces???

 

[mmm4444bot]

Thank you, thank you!

... No spaces???

Apparently, sometimes yes and sometimes no.

~ Mark