University. Lecture on higher algebra. A professor proves a theorem at the school board.
- It’s obvious that in this case A is a sub-group of B.
The professor keeps silent, falls into thinking, looks at the board for 5 minutes and goes out of the lecture hall.
In half an hour he comes back very cheerful:
- Yes, this is really obvious.

 
Short introduction
 
When I studied at the university, a wonderful scientist world-known for his achievements in higher algebra and having a couple of theorems named after him gave us lectures.
 
He worked with the students from the secondary school passing his sincere and fanatic love for mathematics. And as many talented scientists he had a very specific ingredient of character. From time to time, the professor forgot that he was talking to newbie students and started explaining the information in the way that implied us, students who has just graduated from school, have the same knowledge and expertise of the topical area as well as scoop that he had.
 
It inspired and motivated some of us making us get deeper into the science and try to understand what the professor talked about and understand peculiarities of his discipline. But most students just didn’t understand him, fall asleep and tire of the classes. Excessive difficulty on the initial stage demotivated and pushed the students off.
 

 
Some background
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