Roger Hui: In the year 2033 Earth was discovered by Survey Fleet MCXII of the Galactic Empire. The Emperor ordered Earth to send a representative to the court, with strict instructions to “bring something beautiful”.

Emperor: What beautiful things does Earth have?

Earth Representative: Your excellency, our mathematician Euler proved in our year 1737 that +/(1+⍳∞)-s ←→ ×/÷1-(⍭⍳∞)-s

Emperor: What is the ⍭ symbol?

Earth Rep.: ⍭i is the i-th prime.

Emperor: And what is ∞? Does it do anything useful?

Earth Rep.: It denotes infinity, your excellency.

Emperor: (ponders equation for a minute or two) Respect!

Emperor: Neat notation you have there. Tell me more.

Earth Rep.: Your excellency, it’s called APL. It was invented by the Canadian Kenneth E. Iverson …