Are there any solutions similar to those found at https://www.cs.ru.nl/~freek/100/ ?

I know OP personally and have a high regard for him. His blog at https://www.ctrlc.hu/~stef/blog/ is also worth following.

Try this: Discourse on Metaphysics https://www.earlymoderntexts.com/assets/pdfs/leibniz1686d.pd...

This is misleading customers: they are trying to sell a (single-sided) Moebius keyboard as a double-sided one https://www.youtube.com/watch?v=EHqPrHTN1dU

Well, that video certainly cleared things up for me.

https://github.com/metamath/set.mm , if you do not object to your theorems being machine-provable.

I was told: "I suspect that in airplane mode it would only communicate at the specific request of the system (and perhaps in spread spectrum mode), so [before baseband is activated from outside] it would not be worth measuring." What do you think?

Isn't that... totally expected? After all, it's the system that told the modem/baseband to enter airplane mode in the first place. Of course it can also tell it to exit airplane mode.

You are right, bad translation. She was trying to explain that the problem is that, independently of you and against your will, the remote telecommunications system is able to activate the broadband chip of your mobile phone while it is in airplane mode, where you expect the baseband system to be deactivated.

"Here is a list of some of what has been written about this or things we can do:" https://github.com/metamath/set.mm/wiki/Fermat's-Last-Theore...

Simulation of Norvig, same topic: https://nbviewer.org/url/norvig.com/ipython/Economics.ipynb