I don’t know how can I ensert the right braces using latex...

Any help is appreciated...

enter image description here

  • 5
    $\begingroup$ That seems to be a question for TeX - LaTeX, rather than this meta. $\endgroup$
    – Asaf Karagila Mod
    Jan 16, 2019 at 15:38
  • $\begingroup$ A fairly tedious way to do it would be using nested "array" expressions. $\endgroup$
    – hardmath
    Jan 16, 2019 at 15:41

1 Answer 1


Here's an approach, using the cases environment for the left side brace and some array environments to group and brace on the right hand side:

$$ \begin{cases} \left. \begin{array}{l} \frac{dG(t)}{dt} = G_{in} - \sigma_2 G - a\left(c+ \frac{mI}{n+I} \right)G + b \\ \frac{dI(t)}{dt} = \frac{\sigma_1 G^2}{\alpha_1^2 + G^2} - d_i I(t) \end{array} \right\} & , \;\;\; G\lt L_G \text{ or } I\gt I_C, \\ \left. \begin{array}{l} G(t^+) = G(t) \\ I(t^+) = I(t) + \sigma \end{array} \right\} & , \;\;\; G = L_G \text{ and } I\le I_C, \end{cases} $$

Note that the cases environment itself could be similarly replaced by using an array environment plus adaptive bracing. The idea was suggested in this note about the "cases" package.

  • 2
    $\begingroup$ Which is more aesthetically pleasing than the screenshot, I'd say. $\endgroup$
    – Asaf Karagila Mod
    Jan 16, 2019 at 23:31
  • 3
    $\begingroup$ This is nice. The real challenge would be to also have all four of those first equality signs (on each line) perfectly aligned. I guess that's a question for the TeXperts. $\endgroup$ Jan 17, 2019 at 10:57
  • 1
    $\begingroup$ @JyrkiLahtonen: I think you are right about the difficulty of aligning the equations across the cases boundaries. A naive use of the align* environment apparently produces an error message about nested equation structures. $\endgroup$
    – hardmath
    Jan 17, 2019 at 15:51
  • $\begingroup$ or just use {case1\\case2}\raise{-12px}{\bigg\}} doing it for both. $\endgroup$
    – user645636
    Jun 8, 2019 at 2:12
  • $\begingroup$ example:$$\left\{{\left.{case1\\[6px]case2} \right\}\\[6px]\left.{case3\\[6px]case4}\right\}}\right.$$ okay maybe a case environment would be better $\endgroup$
    – user645636
    Jun 8, 2019 at 10:21