Then after 10 minutes he takes a bucket, fills it with exactly the amount of water needed, which he throws along a perfectly parabolic curve through the air, right into the fire. The fire is extinguished and the physicist goes back to sleep again quietly. Then finally the same thing happens to a mathematician. He also wakes up immediately, runs to his desk to grab a pen and some paper and starts to make calculations. Our aim is to prove that horses have an infinite number of legs.
Horses have an even number of legs.
They have two legs in back and fore legs in front. This makes a total of six legs, which certainly is an odd number of legs for a horse. But the only number that is both odd and even is infinity. Therefore, horses must have an infinite number of legs. This completes our proof.