# Why is the LaTeX in my comment unreadable?

Below a Question in Aviation SE I put a comment containing mathematical formulae. I had prepared the formulae using http://www.codecogs.com/latex/eqneditor.php. But it didn't become readable. Why? I paste below the results so you can understand:

I return on my second question. In order to have real solutions (\frac{T}{W}-G)^{2}-\frac{4*Cdo}{\pi ARe}\geq 0 . Then for simplicity of reasoning I define (\frac{T}{W}-G)=x and \frac{4*Cdo}{\pi ARe}=b . So the condition becomes x^{2}-b\geq 0 , but this (second grade) inequation is verified in both following zones: x\geq \sqrt{b} and also x\leq \left - \sqrt{b} \right i.e. \frac{T}{W}-G\geq 2\ast \ \sqrt{\frac{CD0}{\pi \ast AR\ast e}} and also \frac{T}{W}-G\leq-2\ast \ \sqrt{\frac{CD0}{\pi \ast AR\ast e}} . But Raymer exclude the second one, I don’t understand why.

• Can you link to the post / comment? Aviation has mathjax enabled - did you delimit it correctly to make it identifiable as mathjax? – Oded May 17 '16 at 9:48
• MathJax expressions should be delimited with $...$ (or $$...$$ for displayed equations). See, e.g., this fairly comprehensive guide from Mathematics. – user642796 May 17 '16 at 9:49
• @Oded There seem to be a couple comments on this answer. – user642796 May 17 '16 at 9:50

Because you didn't enclose them with $$...$$ as required.
• thank you very much Oded : it just have not be transformed $$x\leq -\sqrt{b}$$ – d.pensopositivo May 17 '16 at 10:14
• Just using single dollar-signs ($..$) would make the expressions inline, and cut down on the vertical space they take up. (Also, for the x \leq \left -\sqrt{b} \right expression, the \left and \right commands expect an extensible delimiter as an argument, which are absent. A relevant TeX - LaTeX question.) – user642796 May 17 '16 at 11:00
• @arjafi - thanks for that, I didn't realize that delimiting  and \$ would be so different. Updated comments. – Oded May 17 '16 at 11:05