How to align equations as in the image below?     Update: I try using array but it takes so much work to align everything in order. For example, I need to know how many columns I need to perform the alignment.
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I am trying to align a multiline equation using array within the equation but it turns out it doesn't do very well. The code I am using is as follows:  \begin{equation}    \begin{array}{lcl} \mathcal{L}^{-1}\left\{f(d)\right\} &amp;= \mathcal{L}^{-1}\left\{f_1(\delta).f_2(\delta)\right\} \\ &amp; = exp(mt) \star \left\{\frac{l}{2\sqrt{\pi t^3}} exp(-l^2/{4t})\right\} \\ &amp; = F_1 * F_2 \end{array} \end{equation}   Can anyone suggest better way to deal with it ?
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I am trying to produce 3 matrices on the same line. And on top of the each matrix, there is a name. I tried using tabular for the names and then I use align for the matrices. However, this creates some kind of space between the names and the matrices, which I do not want. Is there a better way to do this ? I have seen other posts but they do not seem to solve my problem. Please note that I need to use bordermatrix because I need to label the rows and columns as well.   \begin{center} \begin{tabular}{ccc} Kay &amp; Brian &amp;  Edwin \\ \end{tabular} \end{center} \begin{align*} \bordermatrix{ &amp; I &amp; A \cr I &amp;1 &amp; 2 \cr A &amp; 3 &amp; 4 }  &amp; \bordermatrix{ &amp; I &amp; A \cr I &amp;5 &amp; 6 \cr A &amp; 7 &amp; 8 }  &amp; \bordermatrix{ &amp; I &amp; A \cr I &amp;9 &amp; 10 \cr A &amp; 11 &amp; 12 }  \end{align*}
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Is there any way to uncover equation-lines of an align* environment line per line in a frame conveniently?  somethink like  \begin{align*}[&lt;+-&gt;]     a &amp;= b \\     b &amp;= c \\     \Rightarrow \quad      a &amp;= c \\ \end{align*}   or at least only one annotation per line.
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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?
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Related (but not the same):         Earlier today I asked a question about aligning equations in an enumerate environment and got an answer that seemed to work for the example I gave, but it turns out I wasn't really specific enough for my problem.  I'm using align* environments, often as the only part of a list item. (If you're wondering why I'm not using more words to introduce the align*, these are mostly homework solutions where most of the work is algebra, etc.)  Here's my code and what it makes (above the middle line):  \begin{enumerate}   \item \begin{align*}     x^2 + y^2 &amp;= x^2 + (iy)^2 \\               &amp;= (x + iy) (x - iy)   \end{align*}   \item \begin{align*}     \frac{1}{n^2-4} &amp;= \frac14 \frac{4}{(n-2)(n+2)} \\                     &amp;= \frac14 \left( \frac{1}{n-2}-\frac{1}{n+2} \right)   \end{align*} \end{enumerate}     I'm trying to make the baseline of the first line of the align* environment the same as the number's baseline—I want the first line of the align* to have the same vertical position (centered horizontally in the same way) relative to its number as in the second half of my picture. (Side question: why is there so much space before the align* starts?)
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Problem:  I have searched how you can align text without the use of tables using LaTex. What I am after is to align images after each other on one side and text to align to respective image on the right hand side.  Example of problem:    Desired outcome:  Basically I am after to be able to align a photo and corresponding text exactly aligned horizontally to the middle of that photo. Each photo/text part should be divided by an arrow which is exactly aligned vertically in the middle of each photo.  I would appreciate if someone could give advice what the best practice is without using any tables.
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If I am using align to display an equation and have each line numbered, how do I reset the align counter?  As is, even if I use \end{align} and later in the document have a second \begin{align}, the counter continues from where it left off, instead of starting at 1.  Is there any simple way to do this? Or would I be better off creating my own counter and not using align?  Edit: More specifically, I am this to show lines/steps on a solution to homework problems. Separate occurrences of (1) will be in answers to different problems, so there should not be any trouble distinguishing.
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Having different horizontally  distributed equations inside an align environment, only lines are numbered, but not individual equations.    How can the left equations be numbered using subequations? See also the question   \documentclass{article} \usepackage{amsmath} \begin{document}   \begin{subequations}     \begin{align}        %\label{a}         a &amp;= a ,&amp;       \label{b}         b &amp;= b ,\\       %\label{c}         c &amp;= c ,&amp;       \label{d}       d &amp;= d .     \end{align}   \end{subequations} \end{document}     The solution should be able to either:    attach a label to the left equations, or modify the labels on the right to read (1a,b) and (1c,d)    I couldn't find anything in the documentation of amsmath or other packages.
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How can I Tex this equation?  I try to have exactly the same result but for the moment I only succeeded in having intersecting lines... Thanks!
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The align command from amsmath allows me to put two equations side-by-side:  \begin{align} x = y &amp;&amp; a = b \end{align}   Unfortunately for my purposes, this shows both equations under one equation number:  x = y    a = b   (1)   Is there any way to give them individual numbers, so that the output looks  like this?:  x = y (1)    a = b (2)
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Is there any way to override the fact that certain environments in LaTeX are automatically "displayed"?  One such example is the align* environment.  I want to keep my aligned equations inline.  So basically I want something like  \begin{align*} x+y&amp;=z\\ u+v&amp;=w \end{align*}   embedded into a line of text.
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Question : $$\begin{align}a+b+c &amp;= 0\\ a^3 +b^3 +c^3 &amp;= 12\\ a^5 +b^5 +c^5 &amp;= 40\end{align}$$ Then , $a^4 + b^4 + c^4 = ?$  My try : As a common perspective I just went to find any trick related to it and my first step is as usual as a common man will think $3abc = 12$ and got $abc = 4$ After that I am unable to link it with any other equation
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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 similar ones suggesting use split:    Unfortunately, due to the page break issue I have, I need to use align, because split won't auto page break, as described in .
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Some people have asked about how to add multiple paragraphs (when \intertext and \shortintertext no longer work), a fix was proposed by Peter Grill :  He wrote:     My first thought was to hack apart the result of an align and dole   out the lines one-by-one wherever you want them. Alas, align   produces a list of considerable complexity and it is not worth the   effort to unravel it (if that's even possible).      So I made my own alignment environment that, as far as I can tell,   does what you'd want align* to do but produces a very simple list.   My macro \ALineAgain then picks that list apart and drops the lines   one at a time wherever you ask.      Because the lines are not printed where the alignment is actually   given, it makes no sense to have an AlignAgain*; it never prints   equation numbers. Instead, the \ALineAgain macro takes a star that   suppresses the addition of an equation number.   The problem with this code is that the equation numbers seem to be messed up once you try referencing them. Below, I've added only a few lines to Peter's code (notably: \numberwithin{equation}{section}, two section commands, and then a single line at the very end that attempts to reference the two equations).   Rather than printing (1.1) and (1.2), it prints (1.1) and (1.1). There seems to be something wrong with the equations portion of the code. Can anybody spot the problem?   \documentclass{article} % \usepackage{showframe} \usepackage{amsmath}  \numberwithin{equation}{section}  % It's like {align}, but simple! \newenvironment{SimpleAlign} {%  \let\\=\cr  \tabskip 0pt plus 1fil\relax  \halign\bgroup   &amp;\hfil$\displaystyle ##$\tabskip 0pt\relax   &amp;$\displaystyle {}##$\hfil\tabskip 0pt plus 1fil\relax\cr } {%  \crcr\egroup }  % Saves its contents typeset like SimpleAlign.  You can give it a name. \newenvironment{AlignAgain}[1][AlignBox] {%  \expandafter\let\expandafter\AlignAgainBox\csname #1\endcsname  \setbox\AlignAgainBox=\vbox\bgroup\SimpleAlign } {%  \endSimpleAlign\egroup  \ReBox\AlignAgainBox } \newbox\AlignBox  % Prints the lines from {AlignAgain} one-by-one, with or without equation numbers as starred.  If you named the {AlignAgain}, use it here. \makeatletter \newcommand\ALineAgain{%  \@ifstar   {\AlignAgainStartrue\@ALineAgain}   {\AlignAgainStarfalse\@ALineAgain}% } \newcommand\@ALineAgain[1][AlignBox]{%  \expandafter\let\expandafter\AlignAgainBox\csname #1\endcsname  \begin{equation*}   \PutFirstBox\ifAlignAgainStar\AlignAgainBox  \end{equation*} } \makeatother \newif\ifAlignAgainStar  % Reboxes a box in the format: {[1][2]...[n]} -&gt; {[1]{[2]{...}[n]}} % {...} = \hbox \newcommand{\ReBox}[1] {%  % To enter internal vertical mode, where \lastbox is valid  \setbox0=\vbox{%   \unvbox#1\relax   \global\setbox#1=\hbox{\hbox{}}   \loop    \unskip    %\box0 is the box currently at the end of #1    \setbox0=\lastbox   \ifvoid0\relax   \else    \global\setbox#1=\hbox{\box0\box#1}%   \repeat  }% }  % Puts the first box in a nested-box list into the display, saving the rest back in #1 % Optionally places an equation number \newcommand{\PutFirstBox}[2]{%  \hbox to \displaywidth{%   \unhbox#2\relax   \global\setbox#2=\lastbox   \setbox0=\lastbox   \unhbox0%   #1\else\refstepcounter{equation}\llap{(\theequation)}\fi  }% }  \begin{document}  \section{First section} \subsection{A subsection} Hello \begin{AlignAgain}  a &amp;= b &amp; c &amp;= d \label{firsteqn} \\  f(x) &amp;= g(x) &amp; h(x) &amp;= e^{-1/x^2} \label{myeqn} \\ \end{AlignAgain}  This is a paragraph with a lot of redundant words whose only purpose is to extend it onto a new line or two so it's dramatic when I display this equation: \ALineAgain and then follow it with a bunch more text.  And also a new paragraph, just for good measure.  I wonder if the two equations will line up?  I sure hope so! \ALineAgain This is sort of fun.   Can we reference equations by section? Try (\ref{firsteqn}) and (\ref{myeqn}).  \end{document}
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(1,1,-4,3), (2,0,2,-2), (2,-1,3,2)    My question is. how do you know how to make these row vectors and find the rowspace or make them column vectors and find the columspace? Will you get the correct answer regardless? The book made these row vectors.    Is it something to do with having more unknowns than equations? or is it simply choosing these as row vectors makes less rows than if we made column vectors and so there will be less row operations to do and, hence less working out.   I tried doing it as column vectors to see if it gives the same result using column space and I didn't get the same answer as the book finding rowspace of these three row vectors. As  you probably expect because the columnspace would be using the original columns.  Thanks.
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My intention is to create equation which looks similar to one of examples below (I prefer the second one).     There should be an arrow from JKL to DEF and GHI and from GHI to DEF.   Neither alignment nor equation environment have to be used. Anything that will do is appreciated. Cheers.
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I'd like to write the matrix equation A = (x y) B (x y)^T, where (x y)^T is written as a column vector and B is a 2x2 matrix written as such. I can (almost) do this by, for example, the following:  A = (x \ y) \begin{pmatrix} a &amp; b \\ c &amp; d \end{pmatrix} \begin{pmatrix} x \\ y \end{pmatrix}   But I'd like the row vector (x y) to be aligned with the first row of the matrix B. How do I do this?