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I use the \usepackage{amsmath} and the code for the three equations is:

\begin{flalign}
    rez_1[\;] &= \lim_{s \to 0} \left[\frac{2(s + 2)(s + 4)}{(s + 1)^{2}(s^{2} + 2s + 2)}\frac{1}{z - e^{sh}}\right] = \frac{8}{z - 1} \\



    rez_2[\;] &= \frac{1}{1!} \lim_{s \to -1} \left\{\frac{d}{ds} \left[\frac{2(s + 2)(s + 4)}{s(s^{2} + 2s + 2)}\frac{1}{z - e^{sh}} \right] \right\} = \frac{-14z + (14 - 6h)e^{-h}}{(z - e^{-h})^{2}} \\



    rez_3[\;] &= \lim_{s \to (-1 + j)} \left[\frac{2(s + 2)(s + 4)}{s(s + 1)(s + 1 + j)} \frac{1}{z - e^{sh}}\right] = \frac{3 + j}{z - e^{(-1 + j)h}}
\end{flalign}

If you could help me, I would be grateful! Thanks

Mihai Cherechesu
  • 3

1 Answers1

2

You have blank lines between your equations there. Blank lines can't appear in math mode and maths environments and flalign is no different.

You should either get rid of them:

\begin{flalign}
  rez_1[\;] &= \lim_{s \to 0} \left[\frac{2(s + 2)(s + 4)}{(s + 1)^{2}(s^{2} +
      2s + 2)}\frac{1}{z - e^{sh}}\right] = \frac{8}{z - 1} \\
  rez_2[\;] &= \frac{1}{1!} \lim_{s \to -1} \left\{\frac{d}{ds} \left[\frac{2(s
        + 2)(s + 4)}{s(s^{2} + 2s + 2)}\frac{1}{z - e^{sh}} \right] \right\} =
  \frac{-14z + (14 - 6h)e^{-h}}{(z - e^{-h})^{2}} \\
  rez_3[\;] &= \lim_{s \to (-1 + j)} \left[\frac{2(s + 2)(s + 4)}{s(s + 1)(s + 1
      + j)} \frac{1}{z - e^{sh}}\right] = \frac{3 + j}{z - e^{(-1 + j)h}}
\end{flalign}

Or comment them out:

\begin{flalign}
  rez_1[\;] &= \lim_{s \to 0} \left[\frac{2(s + 2)(s + 4)}{(s + 1)^{2}(s^{2} +
      2s + 2)}\frac{1}{z - e^{sh}}\right] = \frac{8}{z - 1} \\
  %
  %
  %
  rez_2[\;] &= \frac{1}{1!} \lim_{s \to -1} \left\{\frac{d}{ds} \left[\frac{2(s
        + 2)(s + 4)}{s(s^{2} + 2s + 2)}\frac{1}{z - e^{sh}} \right] \right\} =
  \frac{-14z + (14 - 6h)e^{-h}}{(z - e^{-h})^{2}} \\
  %
  %
  %
  rez_3[\;] &= \lim_{s \to (-1 + j)} \left[\frac{2(s + 2)(s + 4)}{s(s + 1)(s + 1
      + j)} \frac{1}{z - e^{sh}}\right] = \frac{3 + j}{z - e^{(-1 + j)h}}
\end{flalign}

enter image description here

Off-topic but I'm unfamiliar with rez. As you have it, it is typeset as the product of the variable r, the variable e and the variables z1, z2 etc. If it's supposed to be a single unit \mathit{rez}_{1} or similar might be appropriate.

Au101
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