# Missing brackets on equations

I'm writing a couple of equations in LaTex (it's my first time using it) and, although I'm finding the general usage pretty straight forward I keep getting a missing brackets warning from ShareLatex that I can't fix, it doesn't tell me where it's missing just the line in which it is missing. Could anyone help me figure out where's the missing bracket in these?

Eq.1

\left\lfloor\frac{n}{\log_2 (n/2)}+n^\left(\frac{1}{6}\right)\right\rfloor \leq \Omega(n\wr) \leq \left\lfloor\frac{n}{\log_2(n/2}+n^\left(\frac{1}{2}\right)\right\rfloor


Eq.2

\begin{align*}
T_{prod}F(n\wr)&\simeq\beta n\log\log(n)\sum_{1\leq i\leq \lfloor lg\hspace{2pt}n\rfloor} \log\left(\alpha n2^\left(-i\right)\right)\\
&\simeq \frac{\alpha}{\beta}n(\log n)^2 \log\log n \\
\end{align*}


## 2 Answers

You forgot to put some of your exponents between brackets, so that ^ is followed by \left(. I took the opportunity to slighly improve your formula with the \mathclap command from mathtools.

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{mathtools}

\begin{document}

$\left\lfloor\frac{n}{\log_2 (n/2)}+n^{\left(\frac{1}{6}\right)}\right\rfloor \leq \Omega(n\wr) \leq \left\lfloor\frac{n}{\log_2(n/2)}+n^{\left(\frac{1}{2}\right)}\right\rfloor$

\begin{align*}
T_\text{prod}F(n\wr)&\simeq\beta n\log\log(n)\sum_{\mathclap{1\leq i\leq \lfloor lg\:n\rfloor}} \log\left(\alpha n2^{\left(-i\right)}\right)\\
&\simeq \frac{\alpha}{\beta}n(\log n)^2 \log\log n \\
\end{align*}

\end{document}


• On spot @Bernard, worked like a charm. Thanks a lot for the formula improvement as well! I'll make sure to check the mathtools package in depth :) Sep 29 '15 at 19:43

If you could show the output it would help figure this out, but if you are referring to the \lfloor and \rfloor braces not appearing:

you will want to put the terms appearing between them inside {} see this example

\left \lfloor{\frac{x}{2}}\right \rfloor

inserted into your equation 1:

  \begin{align*}
\left \lfloor{\frac{n}{\log_2 (n/2)}+n^\left(\frac{1}{6}\right)}\right\rfloor
\leq \Omega(n\wr) \leq
\left\lfloor{\frac{n}{\log_2(n/2}+n^\left(\frac{1}{2}\right)}\right\ rfloor
\end{align*}


Produces:

• Missing { inserted. <to be read again> \left l.52 \left\lfloor{\frac{n}{\log_2 (n/2)}+n^\left (\frac{1}{6}\right)}\right... A left brace was mandatory here, so I've put one in. You might want to delete and/or insert some corrections so that I will find a matching right brace soon. (If you're confused by all this, try typing I}' now.) ! Missing } inserted. <inserted text> } l.52 ...2 (n/2)}+n^\left(\frac{1}{6}\right)}\right \rfloor \leq \Omega(n\wr) ... Sep 29 '15 at 19:30
• I've inserted something that you may have forgotten. (See the <inserted text> above.) With luck, this will get me unwedged. But if you really didn't forget anything, try typing 2' now; then my insertion and my current dilemma will both disappear. Sep 29 '15 at 19:30
• This is another log: <to be read again> \left l.62 \end{align*} A left brace was mandatory here, so I've put one in. You might want to delete and/or insert some corrections so that I will find a matching right brace soon. (If you're confused by all this, try typing I}' now.) Sep 29 '15 at 19:31
• I've added your braces but still didn't fix it. I have however discovered that there's something to do with the text align tags. Sep 29 '15 at 19:33
• I don't have 50 rep yet so I can comment on the answer below but he is correct. pdflatex did yell at me about the missing {` on the exponent but just inserted them and moved right along.
– Ajay
Sep 29 '15 at 19:42