@DrYohanJohn
@davidjamesweir
An anecdote from Paul Halmos's autobiography:
In class. The lecturer works through a proof, on the blackboard. At some point he says "It is obvious that ..." and then states the relationship he relies on in his proof.
One student asks: Excuse me, Professor, I don't see why this is obvious. I don't understand it.
The lecturer nods, turns back to the blackboard, looks at the previous steps, thinks, chalks up some calculations in a corner, thinks some more.
Then he turns back to class. "Yes, as I said, it is obvious."
[Quoted from memory, details in the book will differ.]
#PaulHalmos #ItIsObvious #proofs #HigherEducation