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I need to have those writing on my $Y$ axis and $X$ axis:

$$\frac{\text{d} \Psi_{\nu}}{\text{d}t}$$ for what concerns the $Y$ axis, and a trivial $t$ on the $X$ axis.

Clearly I know how to write $t$.

What I cannot do is the derivative symbol.

Also, once I wrote the label, it is not saved not the original figure.

For example, this is my code for the moment:

Labeled[
  Plot[
    {Gamma[1.25]*(1 - MittagLefflerE[0.25, 1, -z^(0.25)])/(z^(0.25)), 
     Gamma[1.5]*(1 - MittagLefflerE[0.5, 1, -z^(0.5)])/(z^(0.5)), 
     Gamma[1.75]*(1 - MittagLefflerE[0.75, 1, -z^(0.75)])/(z^(0.75)), 
     Gamma[2]*(1 - MittagLefflerE[1, 1, -z])/(z)}, {z, 0, 2}, 
    PlotRange -> {0, 1}, 
    PlotStyle -> 
      {{Black, Bold}, {Black, Dotted, Bold}, 
       {Black, Dashed, Bold}, {Black, DotDashed, Bold}}, 
    AxesLabel -> {"", ""}, 
    LabelStyle -> {FontSize -> 13}], 
  {t, Subscript[ψ', ν]}, {Bottom, Left}, RotateLabel -> True]

But when I am going to save the file.eps, non of the label are present. The writings are disappeared. How to solve this?

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For the first part of your question I believe a combination of HoldForm and TraditionalForm should work for you, e.g.

TraditionalForm[HoldForm[D[Subscript[ψ, ν], t]]]

enter image description here

At the moment I am unable to replicate the export-to-EPS problem but I am sure I have seen other questions regarding problems with EPS.

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  • $\begingroup$ @AlanTuring I am glad I could help. What version of Mathematica and what platform are you using? I am trying to find a relevant Q&A for the export issue. $\endgroup$ – Mr.Wizard Jan 23 '17 at 12:35
  • $\begingroup$ Oh right, I forgot: It's Mathematica 10.0.2.0 for Mac OS X $\endgroup$ – Henry Jan 23 '17 at 12:38
  • $\begingroup$ @AlanTuring Please try the function provided in this answer: mathematica.stackexchange.com/a/8413/121 $\endgroup$ – Mr.Wizard Jan 23 '17 at 12:41
  • $\begingroup$ You're very nice, but frankly I understood nothing about the other part, from those answers. And I gave up, because it's really impossible that a super cool software like Mathematica couldn't have ANY SIMPLE IMPLEMENTATION for the labeling. It's unbelievable. $\endgroup$ – Henry Jan 23 '17 at 16:08
  • $\begingroup$ @AlanTuring In that case I am sorry I couldn't be more helpful. I consider my answer here a sufficiently simple implementation, but Mathematica lacks publication quality typesetting which is why I linked to the $\LaTeX$ Q&A's as I believe that is how most people handle that deficiency. As for export to EPS failing I think that is a bug or possibly a system configuration issue (fonts?) and I would still like to try to help you resolve that if you have the interest. $\endgroup$ – Mr.Wizard Jan 24 '17 at 0:12

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