my favourite mathematical joke

A biologist, physicist and mathematician are travelling by train in Scotland. Out of the window, they see a black sheep.

"Look, the sheep in Scotland are black," says the biologist.

"No, we can conclude only that some sheep in Scotland are black," says the physicist.

The mathematician says: "No, we know only that there is at least one sheep in Scotland, at least one side of which is black!"

Anne C. A. Baanen@Vierkantor@mastodon.vierkantor.commy other favourite mathematical joke

A biologist, physicist and mathematician are in a café, watching a house across the street. They see three people enter the house, and a while later four people leave the house.

The physicist says: "I thought the house was empty at the start. There must have been a measurement error."

The biologist says: "Why? They could have reproduced in the meantime."

The mathematician says: "Both of you are wrong. If one person enters the house, it will be empty again."