[Tex/LaTex] Math symbol doesn’t work properly

math-modemath-operators

Something quite strange. Why I have as a result of the following formula:

\begin{equation}
\omega=\lambda_{1}\Sigma^{-1}\bf{1}+\lambda_{2}\Sigma^{-1}\mu
\end{equation}

a black square instead the sigma symbol? in the first part is ok. I am becoming a bit crazy trying to find out the error. I tried everything, to separate, to isolate, to write the formula with double $$ rather than \begin{equation}, packages loaded are the normal ones, etc… Any other symbol works perfectly but with \Sigma is quite weird, this is what I got no matter the way you try to write the formula.

Thanks for your support!

Best Answer

Using this code:

\begin{equation}
\omega=\lambda_{1}\Sigma^{-1} \mathbf{1}+\lambda_{2}\Sigma^{-1}\mu
\end{equation}

returns this output:

Only the \bf command was exchanged with \mathbf.

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[Tex/LaTex] Stacked symbol doesn’t align properly. Why

This is because (H) is wider than =, causing the entire stacked symbol to be wider than the rest of the alignment characters. you can remove the width of (H) by using \mathclap from mathtools:

enter image description here

\documentclass{article}
\usepackage{mathtools}% http://ctan.org/pkg/mathtools
\newcommand{\limq}[2]{\lim_{#1 \rightarrow #2}}
\newcommand{\abs}[1]{\left|#1\right|}
\begin{document}

\begin{align*}
    \limq{n}{\infty} \abs{\frac{a_{n+1}}{a_n}} & = \limq{n}{\infty} \abs{\frac{\frac{(n+1)^2}{2^{n+1}}}{\frac{n^2}{2^n}}} \\
                        & = \limq{n}{\infty} \abs{\frac{(n^2+2n+1)2^n}{(2n^2)2^n}} \\
                        & \stackrel{\mathclap{\text{(H)}}}{=}  \limq{n}{\infty} \abs{\frac{2n}{4n}} \\
                        & = 1/2
\end{align*}
\end{document}

[Tex/LaTex] Tables: Missing $ inserted

Things like \Large R_B (as seen in your error message) are only possible in math mode. Write instead

\Large $R_B$

and {\Large R_C} needs no {...} Write it as \Large $R_C$ and so on. Everything inside a tabular cell is local. And if your whole tabular should be written with the \Large setting use:

{\Large
\begin{tabular}{...}
...
\end{tabular}\par}

If you have only math expressions in your tabular use

\usepackage{array}
...
\begin{tabular}{>{$}c<{$} ... }
...
\end{tabular}

or use the environment array instead of tabular. I both cases you can insert normal text with \text{...} (amsmath), \textrm{...}, and/or \mbox{...}. The first one is the best choice.

Best Answer

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[Tex/LaTex] Stacked symbol doesn’t align properly. Why

[Tex/LaTex] Tables: Missing $ inserted

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