Hey! I heard that Lean thinks 1/0 = 0. Is that true?
Yes. So do Coq and Agda and many other theorem provers.
[...]
But doesn’t that lead to confusion?
It certainly seems to lead to confusion on Twitter. But it doesn’t lead to confusion when doing mathematics in a theorem prover. Mathematicians don’t divide by 0 and hence in practice they never notice the difference between real.div and mathematical division (for which 1/0 is undefined). Indeed, if a mathematician is asking what Lean thinks 1/0 is, one might ask the mathematician why they are even asking, because as we all know, dividing by 0 is not allowed in mathematics, and hence this cannot be relevant to their work.
Leanorris.
Dangerous Nostalgia.
Kenya, and almost every African country, was birthed by the ending of empire. Our borders were not of our own drawing. They were drawn in the distant colonial metropoles of London, Paris, and Lisbon with no regard for the ancient nations that they cleaved apart.
Today, across the border of every single African country live our countrymen with whom we share deep historical, cultural and linguistic bonds.
At independence, had we chosen to pursue states on the basis of ethnic, racial or religious homogeneity, we would still be waging bloody wars these many decades later.
Instead, we agreed that we would settle for the borders that we inherited. But we would still pursue continental political, economic and legal integration. Rather than from nations that looked ever backward into history with a dangerous nostalgia, we chose to look forward to a greatness none of our many nations and peoples had ever known.
Einundeulzig.
When do you (dare to) remove someone from your birthday calendar?
Byzantine Messenger.
One checkmark when the message was sent.
Two checkmarks when it was read.
Three checkmarks when it was sent that it was read.
Four checkmarks when it was read that it was read.
Five checkmarks when it was sent that it was read that it was read.
etc.
Whatever it might be.
It's not really lost if you can still ping it.