why "{" is treated as vi(1) section delimiter

[Anton Shterenlikht]

vi(1) motion commands "]]" and "[[" move to
beginning of next or previous section respectively.

Using vi(1) ":set sect" command I can verify
that a section in my case is set to:

sections="NHSHH HUnhsh"

Why then on a *.tex file the above motion
commands move to "{" in the first column?

For example, in this file:

    1   It is possible to show using linear algebra that Tresca cylinder has
    2   a hexagon as a base, and von Mises condition has a circle. Because
    3   neither is dependent on the volumetric stress, it is convenient to
    4   plot stress states on 2D plane normal to $\sigma_{kk}=0$ plane,
    5   {\em deviatoric plane}, see Fig. \ref{fig:plane}
    6    
    7   \begin{figure}[htb]
    8   \centerline{\includegraphics[width=6cm]{./figs/yield_plane.pdf}}
    9   \caption{Tresca hexagon and von Mises circle on the deviatoric plane.}
   10   \label{fig:plane}
   11   \end{figure}
   12   

vi "[[" or "]]" move to line 5.

Many thanks

-- 
Anton Shterenlikht
Room 2.6, Queen's Building
Mech Eng Dept
Bristol University
University Walk, Bristol BS8 1TR, UK
Tel: +44 (0)117 331 5944
Fax: +44 (0)117 929 4423