Place a sheet of paper on the desk and draw around its outline with a marker. Now scrunch up the sheet, without tearing it, and put the scrunched-up paper inside the outline you marked. It is absolutely certain that one (at least) point of the scrunched-up paper is vertically above the point of the desk that point rested on when the paper was flat and you were drawing the outline.151

Endnote 151 reads as follows.

A related theorem, due to topologist Heinz Hopf (1894-1971), and often confused with Brouwer's FPT, assures us that at some point on the Earth's surface at this moment, there is absolutely, though instantaneously, no wind. Or equivalently, imagine a sphere covered with short hair, which you are trying to brush all in one direction. You will fail. No matter how you try, there will always be one (at least) "whorl point" where the hair won't lie down. This has led to the theorem being referred to rather irreverently by generations of math undergraduates as "the cat's anus theorem."(I have bowdlerized slightly.) Thus considered, the theorem states:  Every cat must have an anus.

For some reason this theorem inspired me to verse.


(이게 내가 찾은 떼껄룩 항문정리 글이였음)

다른곳에다 물어보니 가장 납득되는 답변이 이거임: 여기서 털로 덮힌 공을 한 방향으로만 빗질 할 때 못 하는곳이 항상 있다고 하는 이부분에서  이 빗질이 끊기는 부분을 whorl point라 하는데 고양이들을 빗질하려 할때 항상 실패하는곳이 Anus(whorl point) 이고 또 이 실패하는곳이 항상 있으니 좆냥이들은 반드시 항문을 가진다고 하는거인듯 비유인거지 그냥 


시발 뭔가 했네ㅋㅋㅋㅋㅋ