@LeoLiu The problem of your fantastic answer is that
ligatures
don't work if you are working with Windows (I think MaC includes the ligatures). Regarding your comment about
mathptx
and
times
package, I don't know if they use the font you say. But, anyway, Numbus Roman No9 L is a free font practically identical to Times New Roman and it includes the ligatures. It is avaible
here (FREE). Finally, I'd like you to develop your note about
pclnfss
package. It is avaible in the MiKTeX's repository but I haven't managed to make it work. —
Dog_69 Jan 7 '19 at 19:17