Mixone Mixone - 2 months ago 4x
LaTeX Question

Curly brace error occurring when curly braces are closed correctly

As title says I get error:

line 55: Missing { inserted ... $$\sum_{i=1}^{n} \lambda_i v_i =O_\vec{E}
line 55: Missing } inserted ...v_n \in A =>\lambda_i =0,...,\lambda_n =0$
: Not defining \perthousand.
: Not defining \micro.

The exact line and its context are:

\item On dit que A est \textit{libre} si le seule c. l. de vecteurs de A egales a $O_E$ est la c. l. triviale.
\item C'est-a-dire si:
$$\sum_{i=1}^{n} \lambda_i v_i =O_\vec{E}, v_1...v_n \in A =>\lambda_i =0,...,\lambda_n =0$$

The packages I have imported are:

\usepackage[margin=.75in, a4paper, portrait]{geometry}


The problem here stems from the somewhat greedy nature of the subscript routine when you use


It grabs \vec without it's argument giving rise to the problem. Here are my suggestions to fix your situation:

Here is a complete minimal example:

enter image description here


  \item Here is some \textit{regular} text, mixed in with $O_E$ some math.
  \item And a display equation:
      \sum_{i=1}^{n} \lambda_i v_i 
        = O_{\vec{E}}, v_1,\dots,v_n \in A 
        \implies \lambda_i = 0,\dots,\lambda_n 
        = 0