/sci/ - Science & Math

>>9091395
"It is obvious from a previous theorem that this is equivalent to..."

>Proof: Think.

>>9091395

"One day Shizuo Kakutani was teaching a class at Yale. He wrote down a lemma on the blackboard and announced that the proof was obvious. One student timidly raised his hand and said that it wasn't obvious to him. Could Kakutani explain?
After several moments' thought, Kakutani realized that he could not himself prove the lemma. He apologized, and said that he would report back at their next class meeting.
After class, Kakutani, went straight to his office. He labored for quite a time and found that he could not prove the pesky lemma. He skipped lunch and went to the library to track down the lemma. After much work, he finally found the original paper. The lemma was stated clearly and succinctly. For the proof, the author had written, 'Exercise for the reader.'

The author of this 1941 paper was Kakutani."

>>9091395
>your task is to finish up the rest of the proof and bring it for the next lecture.

WHAT THE FUCK. YOU CAN'T FUCKING FINISH TYPING UP THE FUCKING SHIT.

>>9091395
Stop this

>>9091429
(Why?)

>>9091434
Kek

What's the problem? If author leaves proof as an exercise it means that having grasped all the previous material you should be able to prove this, if you can't, well, it's your problem that you're a brainlet

>>9091466
Recall lemma 2.x.10 in index A, and its trivial application to theorem 3.1VII in [4], we conclude (56) is homotopic to (32) in [45] by inspection."

>>9091469
so, authors should write same shit hundreds of times just because you're an idiot and don't know you can just flip the pages and find the lemmas in question?

>>9091475