Fair enough, as a computer scientist I got tought to use the Neumann definition, which includes zero, unless stated differently by the author. But for general mathematics, I guess it’s used both ways.

Actually, those are not the same. Natural numbers include zero, positive integers do not. She shoud definately use ‘big naturals’.

Edit: although you could argue that it doesnt matter as 0 is arguably neither big nor large

I’m going to assume you’re in a country where they have the self checkout things which have a ‘bagging area’ of some sort wit a scale under it?

In the Netherlands we have selfcheckout without this weighing. You walk into the store, grab a handscanner, and as you walk through the store you can pick something up, scan it, put it in your own bag and continue. When you get yo the register, you scan some barcode on the screen of the register woth your scanner, touch your nfc bank card to the terminal, and walk out. No need to take anything out of your bag.

Sometimes they do random checks, then some employee comes over and scans a few items from your bag. But you can just let it be their problem. They’ll usually put the stuff they’ve taken out back in again aswell.

Nice, great step! Just in case: did you check if you have any forgotten “log in with facebook” linked applications? You might want to check them to see if you have configured an alternative login. If you’re not sure, I very strongly advise you to undo the delete while it is still possible, and go into settings to check for this. When you’re sure you’re all good, you can just delete the account again.

How do they currently solve this problem for passwords? You could just have the register/create account button lead to a pubkey upload instead of a ‘set password’, no?

For the first issue thats not realy true. To access the totp key you still need the actual device with the key, it’s only now split over multiple devices. Like having multiple bank cards for the same account.

For the seccond issue: Thats a good point, I have not found a good solution for that either, unfortunately

I use vaultwarden (selfhosted bitwarden), which stores both passwords and OTP keys on my own server, which I backup regulary. This allows acces to my OTP keys from any device, as long as it’s in my local network or connected to my VPN.

Must say I really like this solution. If one of my devices fail, I have a pretymuch seamless switch to any of my other devices, which are already configured anyways, since it’s also my passwordmanager.

If the server fails, my phone, pc and laptop all still have the keys cached, so I can use those untill I’ve restored a backup.