I think we could call the shortcuts respectively 'prologue' and 'epilogue' using a literary key
But I mean also show the number of current page riproduce to help the user surfing the PDF's tree!

OK, but what do you think the actual keyboard shortcut should be?

Or even better, point to the same file, containing the current release with all installers.

That would also work, of course

As written in the nPDF thread,

Also, you don't need to use the PRG file on OS 3.6. The ndless_resources.tns file from Ndless 3.9 that has Zehn support actually works on 3.1 and 3.6. Just replace your ndless_resources.tns with the one from 3.9, nPDF.tns should run. Unfortunately, this isn't well-documented.

I'll have to try your latest nTxt version, lkj. I think I have version 11 on my calc

You can try using TiLP instead: http://lpg.ticalc.org/prj_tilp/index.html
Also, since you deleted your OS, you can get a copy of 3.9.1 to install here: https://tiplanet.org/forum/archives_voir.php?id=142298
DO NOT install 4.0, you will not be able to install Ndless until a new version is released.

Don't worry my friend, I contacted you also through private message and in I first time I believed you would have been kidnapped, but yesterday I saw your answers on Github that heartened me

No, I haven't been kidnapped

Your last release 0.3 is dated January of this year if I remember well, I would absolutely love a new beta version with the MuPDF updated (seems yet done standing at the Github)

I agree that the 0.3 release is outdated, so I plan to make a "0.4 beta" release tomorrow. I won't be able to add any more features, but it will be a somewhat significant update. I will also include a "-DNOCJKFULL" build that will support EPUB and HTML (but will be bigger).

I read in minute detail the 3 new issues opened on nPDF page and my opinions are :
1) about scrolling behaviour I agree with your proposal of a config option leaving to the final user the choice to set scrolling mode as he prefer
2) about the epub reading, if I understood well you have an idea how to fix it, and also if it redoubles the size of nPDF.tns I think you could release a test build for giving this possibility to consumers that want to try epub dynamic rendering during zooming!
3) about the search function https://github.com/Legimet/nPDF/issues/13 when I run for the first time nPDF I was sure it would be yet implemented, I think it's a fundamental function and standing at your words that 'should be easy to do' I'm very faithful.

After the 0.4 beta version is released, I will add support for searching and the 3 scrolling modes. As I said, I will include a larger-sized build with EPUB and HTML support in the beta version, but support in the smaller version is contingent on the resolution of this bug.

I'm very satisfied using that app to view PDFs into my Android devices, and in the meanwhile I received this comment from you I've crucified every developer or also user that could have helped teaching me how to update that blessed MuPDF library

I use the MuPDF Android app too!

There are tutorials for installing Ndless on OS 3.1, 3.6, and 3.9 here: https://tiplanet.org/forum/ndl3ss.php. What exactly have you tried, and what doesn't work?

Actually, the reason it doesn't work is because 1/4 isn't an integer. If a, b are real and c is an integer, then

##e^{c(a+bi)}=e^{ac}\cdot e^{bci}=e^{ac}(\cos cb + i\sin cb)=(e^a)^c(\cos b + i\sin b)^c=(e^{a+bi})^c##

But note that we used De Moivre's law, which only holds for integers.

An article about this was just released on TI-Planet: https://tiplanet.org/forum/viewtopic.php?f=43&t=16900

Yes. nPDF should work on 3.9. It's not very usable right now, but I've resumed work on it.