# Linked Questions

2answers
122k views

### label multiple lines of equations [duplicate]

Suppose I have the equations \begin{align} f(x) = x^2 g(x) = \exp( x ) \end{align} I would like to use on single label for these lines, and ideally the equation number would be placed vertically ...
3answers
636 views

### How to give two equations the same equation number? [duplicate]

I want to write two equations in consecutive lines and I want to give them a single equation number. Often, in notebooks, we write multiple equations in consecutive lines and use a big } sign to ...
1answer
361 views

### Label a block or systems of equations with one label [duplicate]

Possible Duplicate: How to get only one vertically centered equation number in align environment with two equations I have a big system of equations which I want to label as one block. I do want ...
1answer
478 views

### How to make an align environment with multiple equations per line and one equation reference? [duplicate]

I would like to use an align environment with a single equation number but with multiple equations per line. For example, the following two pieces of code work: begin{align} a&= 1 & b&= 2 ...
0answers
38 views

### How to number two-line function definitions [duplicate]

Lets say we have a two line function definition, for example, a translation \begin{align} t_{p,q}\text{ : }&\mathbb{R}^2 \longrightarrow \mathbb{R}^2 \\ &(x,y) \longmapsto (x+p, y+q) \...
4answers
224k views

### Show equation number only once in align environment

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}
4answers
138k views

### align* but show one equation number at the end

I am using align*, but I still need an equation number. I know one solution is to use align and add \nonumber to all lines but the last. Is there a 'lazy' way to do it? I searched a little and found ...
3answers
7k views

### How can I number a few equations together

i would like to write few equations, but all the equations will get only once numbered and in the middle (right side) of the equations. e.q. if i write 3 equations, the number will be to the right of ...
3answers
38k views

### How can I label only one line of an equation array?

Consider the following commands to create a labelled multi-line equation array: \begin{eqnarray} \label{eqn:1} X&=&Y+Z\\ &\leq & U \times W. \end{eqnarray} It creates a two-line ...
1answer
16k views

### Systems of equations with a single number

I want to write a numbered system of equations. Right now, this is what I do and I am satisfied with the output, but I have a feeling it's not the best way to do it. \begin{equation} \begin{array}{...
3answers
398 views

### How to align 'parts' of these equations?

I have a set of equations given by the following code: \begin{equation} \label{eqn:eraserStart} \max \, d \end{equation} \begin{equation} a_t \in \{0,1\} \, \forall t \in T \end{equation} \...
2answers
336 views

### Equation broken into two (centered) lines with equation number in the middle of both lines

I would like to know how to break a long equation into two lines and have both lines centered. Besides, I would like to have only one equation number in the middle of both lines. Here's a MWE: \...
1answer
105 views

### Problem getting my equation alignment / numbering right

I've struggled to get my alignment look nice for quite a time now. After a lot of googling I have finally achieved almost what I want: Now the problem is the equation numbers (1 and 3 in the example),...
1answer
278 views

### Only one equation number with math-vfill-tombstone symbol

Maybe what I want is sinful, but let me explain: I use aligned* environments, because I usually don't need equation numbers. When I need one, I use \addtocounter{equation}{1}\tag{\theequation} from ...
1answer
46 views

### Show system of equations with one number and centered

I have an equation which I rearrange in several steps. I want to show this, by having a single numbered equation, which has an aligned equal sign on the right, and the terms left of the equal sign are ...

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