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I need something like this:

first line  (1a)
second line (1b)
third line  (1c)

all lines should be aligned to left

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Welcome to TeX.SX! You can have a look at our starter guide to familiarize yourself further with our format. – Marco Daniel Mar 15 '14 at 12:43
up vote 4 down vote accepted

(Update according to egreg's commend. Thanks!)

The first example of empheq given by Bernard is invalid if omitting the overload option when loading empheq package. For the latex file provided by Bernard, it has no problems at all. However, when I used \usepackage[overload]{empheq} in IEEEtrans with a lot other packages loaded, it will freeze the pdflatex on my computer, I cannot see why, so I loaded it without overload option. Here is the version when loading empheq without overloadoption (\empheqlbrace is the big left parenthesis. \, is just used to add extra space; the default is too tight.):

      & (I \otimes e^A) \psi\left(A^T \oplus (-A) \right) \\
      & (e^{A^T/2} \otimes e^{A/2}) \operatorname{sinch}\left(\frac{1}{2}[A^T \oplus (-A)]\right) \\
      & \frac{1}{2}(e^{A^T} \oplus e^A) \tau\left(\frac{1}{2}[e^T \oplus (-A)]\right),

whose output looks like: enter image description here

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Welcome to TeX.SX! While I prefer the syntax you used, I tried Bernard's example with TeX Live 2015 and it works without problems. Maybe you didn't notice the overload option. – egreg Aug 5 '15 at 16:03

Two solutions: one with the empheq package and an align environment, another with the subnumcases environment from the cases package. I had to adjust spacing for the brace in both, as I found the default was not so good (too small in the first case, too large in the second):




    \begin{align}[left = \empheqlbrace\,]
      & a = b \\
       & c = d

    \!\! a = b \\
    \!\! c = d


enter image description here

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