I want to add an equation number in a formula, but I've got an error: "You can't use `\eqno' in math mode.". This is my code:  $e_{33} = 0 \eqno(4.4)$   How I can fix it?
121965
I searched the internet but I cant find a solution for my problem. I want a numbered and labelled equation inside the text.Something like:  The equation a+1=b (2.1) does ...   The equation a+1=b shouldn't be in a new line like usual  The equation a+1=b (2.2) does...
34059
How can I change the labelling of an equation? Instead of (1.1), (1.2) I want to have (Equation 1.1), (Equation 1.2), ...  Document class is scrbook.  I use the following related packages:  \usepackage{amsmath,amssymb,amsthm}   Example of an equation:  \begin{equation} \label{eqn:example} a+b=c \end{equation}
17198
Pages has since a relatively recent update a very useful way to insert equations using .   On multiple occasions, I have wanted to add tags to equations—a custom equation number on the right side of the equation. However, the \tag{} command doesn't seem to work in Pages. Is there any other way I can achieve this?   Three possibilities which come to mind are a) using a table with two cells, putting the equation in the left one and the equation number on the right, b) adding the equation text above or below the equation (but unfortunately not to the right), or c) adding spaces and then the tag manually (which seems to be a terrible idea). Is there a better way to do it?
101221
Is there anything in a custom formatted formula which defines the text alignment?  I know the different parts of the formula is numbers, negative numbers and so on, but I need to set the alignment.  Example:  _*# ##0_;_*(# ##0)_;_*"-"??_;_@_
66746
I have a very simple problem. I want to write "a" in an equation, however output is .... Please see output. How i can overcome this problem?
71356
Hello, please, can you put the numbering of my expression to the end of a row after the fraction. Thanks in advance  \begin{equation} \label{eq1} \begin{split} t_{j,\text{same rode}} = \ &amp; \frac{\pm\sqrt{2\cdot accel_j \cdot d^{connection}_{j} + speed_j^2} - speed_j}{accel_j} = \\          = &amp;  \frac{\sqrt{2\cdot accel_j \cdot d^{connection}_{j} + speed_j^2} - speed_j}{accel_j} = \\         = &amp;  \frac{\sqrt{2\cdot accel_j \cdot \sqrt{\biggr(y_0 \pm r - (y_j \pm d_j^{\text{while waiting 0}})\biggl)^2} + speed_j^2} - speed_j}{accel_j}  \end{split} \end{equation}
38086
I have several parent equations each with more than 30 subequations. When I write it normally with subequation command, I receive "counter too large" error.  I found out that there is a package named "alphalph" which can solve these numberings with different styles. I have seen  for subequations in StackExchange, but it doesn't work for me! I still get the error!! (since I want to refer to them later, I need to label them too).  Does anybody know where the problem is, or suggest an alternative?  Thanks
13761
Equation exceeds one column of IEEE pattern in LaTeX how should I correct it? Please help, the code is attached herewith.  \begin{equation}\label{eq11}         p\left( {v,h|u,y,...} \right) = {\rm{RelU}}\left( {\left[ {\hat b + {w^h}\left\{ {\left( {{v^T}{w^v}} \right) \circ \left( {{y^T}{w^y}} \right)} \right\}} \\ \right]*\left[ {\hat a + {w^v}\left\{ {\left( {{h^T}{w^h}} \right) \circ \left( {{y^T}{w^y}} \right)} \right\}} \right]} \right) \end{equation}
75030
I have a question on how to have the following in an equation.   Here is some working code to start with:  \documentclass[12pt]{article}  \begin{document}  \begin{equation} P(X)=\sum_{X\in A}\cdots \sum \end{equation}  \end{document}
57742
\documentclass[aps,twocolumn]{revtex4}  \usepackage{epsfig}   \usepackage{amsmath}   \usepackage{epsfig}    \renewcommand{\baselinestretch}{1.45}   \begin{document}  \begin{equation}   V_S(x)=V_1 \Theta(x/a) + iV_2 \delta(x/a),~       \Theta(x&lt;0)=0,\Theta(x&gt;0)=1.       \end{equation}  \end{document}   Equation number is not coming on same line, in two column document class, please help ??
120809
So, I'm writing a mathematics paper, and let's say I have the following:  \begin{equation*} 2+2=4 \end{equation*}   Is this the proper way to do an unnumbered equation, or is it preferred to do the following:  \[ 2+2=4 \]   My question really is: what's the difference between doing \begin{equation*} and \begin{equation*} versus doing \[ \]? Is there a setting in which one may be preferred over the other?  Thanks in advance.
32875
I'm facing a problem with my document that has many equations. The problem with the labelling issue if I decide to modify or add new equations. Basically so far, I'm using \label{eq4.1} where 4 for the chapter four and 1 for the first equation. With this approach, if I decide later to add new equations before eq4.1, then I have to change all subsequent equations to reflect this change. I'm looking for a better and flexible approach to cope with this problem.   \documentclass{article} \usepackage{amsmath}  \begin{document}  \begin{align} x &amp;= 2^{100}, \label{eq4.1} \\ y &amp;= 2^{100}, \label{eq4.2} \\ z &amp;= 2^{100}. \label{eq4.3} \end{align}  These are \eqref{eq4.1} and \eqref{eq4.2} and \eqref{eq4.3}.   \end{document}
65906
Say I had;   \begin{equation}   \begin{cases}      x = 0 \\      y = 0 \\      z = 0     \end{cases}     \qquad \text{and} \qquad     \begin{cases}      x = a \\      y = a \\      z = b     \end{cases}   \end{equation}   How could I insert a brace ( } ) in the second 'cases' to say x and y are equal to a. (i.e. } = a ).   I hope this is clear, if not I can sketch it out - just let me know!  Thanks in advance!
25494
I always use align in my documents, and avoid equation. Is there anything wrong with that? My reasoning behind this: align > equation, so why not use it?
102686
I tried this and that, but could not solve this problem. Here is the code that produces this error:  \begin{equation} o=g(h)=\left\{\begin{array}{rcl}     1 &amp; if &amp; h &lt;   0 \\     0 &amp; if &amp; h \le 0  \end{array}\right \end{equation}   The error is given on the line \end{equation} resides. Thanks.
1863
I have a paper where all equations are numbered, but I want to number equations only if they are actually referred to in the .tex file using \ref{}. How can I make that happen? Alternatively, how can I make all equations that have no \label next to them (because then I know I don't refer to them) not have a number? Do I have to use \nonumber separately for each such equation?
31091
I want the equation number to be shown only at the last line, or better, somewhere in the middle of all. So instead of (1), (2), ... only (1). I use \begin{align} ... \end{align}