Matrix was a masterpiece, matrix reloaded was garbage. Is calc2 matrix reloaded but for math? Yes it is. https://t.co/55u37XolWL

How do you usually end a proof? If it's handwritten i use #, and if it's latex-written i use □.

https://t.co/LksHHs5v9f

Can you solve this delightful problem?

Sources
Catriona Agg (@Cshearer41)
https://twitter.com/Cshearer41/status/1096690119053062144
Nèstor Abad proof
https://twitter.com/nabadvin/status/1096696884964589568
Ignacio Larrosa Cañestro animation
https://twit…

(Submitted by @DespicableMeme1)

if you know, you know