# [Tugindia] Suggestions requested

E. Krishnan ekmath at asianetindia.com
Thu Aug 4 09:13:24 CEST 2005

On Wed, 3 Aug 2005, mkalidoss wrote:

> I have appended a tex file below; this file is used
> to produce three lines of output.
> 1. In the first line I have used \cdot 3; is this correct?
>     Or should we use .3?

It is largely a matter of (local) mathematical convention. In USA, the
decimal point is mostly put on the baseline, as in 3.14, but in England it
is put in the middle as $3 \cdot 14$. In some other European countries
such as France, they use a comma instead of a dot as in 3,14. In our own
country, I think we ususally follow the US way.

> 2. In the second line, to give the limits to \lim, I have
>     used \limits after declaring \mathop{\lim}.  Is this
>     correct?

\lim is already defined as a mathoperator, so that you can give limits to
it directly. (See the modified code)

> 3. In the third line, LHS of the equation seems to be
>     OK, while on the RHS, the alignment of y_1 and y_2
>     is not suitable.

I think the whole code is slightly overdone. Please have a look at the
modified code below:

\documentclass{article}
\usepackage{amsmath}

\begin{document}

\begin{equation*}
M_R = \underset{R_{.4}}{%
\begin{bmatrix}
1 & 1\\
0 & 0
\end{bmatrix}}
= \begin{matrix}
x\\
y
\end{matrix}
\overset{%
\begin{matrix}
a & b\\
\end{matrix}}{%
\begin{bmatrix}
.3 & .2\\
0 & 1
\end{bmatrix}}
\end{equation*}

\begin{equation*}
\lim_{w\to\infty}(a^w+b^w)^{1/w} = \max(a,b).
\end{equation*}

\begin{equation*}
\begin{matrix}
x_1\\
x_2
\end{matrix}
\overset{%
\begin{matrix}
y & y
\end{matrix}}{%
\begin{bmatrix}
1 & 1\\
1 & 1
\end{bmatrix}}
= \begin{matrix}
x_1\\
x_2
\end{matrix}
\overset{%
\begin{matrix}
y_1 & y_2
\end{matrix}}{%
\begin{bmatrix}
1 & 1\\
1 & 1
\end{bmatrix}}
\end{equation*}

\end{document}

--
Krishnan