I asked a question about the possibility of writing a good mathematical textbook which consists of series of exercises(it contains no proofs and the readers are expected to prove all the propositions which are carefully chosen and ordered, and are simple enough). I got several useful comments and answers. However, it was closed for a reason I could not understand. Moreover it seems to be removed(I cannot find it). I would like to know the reasons for the closure and the removal.
I'm a new user here, but apparently your question is too subjective. There is no fixed answer! Everyone's experiences differs throughout his academic life. Stack Exchange do not encourage this kind of never-ending debates. It's like asking, mathematics philosophical questions, like "Is infinity a number?"Anyway, my feelings on your question. Here goes. I feel very strongly about this subject matter, of teaching pedagogy. I'm an asian chinese student at a singaporean university. Do note that Singapore scores very high or top regularly at international tests for maths, but yet, there is a glaring dearth of mathematics research in the country.
Before I entered university, I was schooled in a curriculum that uses "good mathematical textbook which consists of series of exercises(it contains no proofs and the readers are expected to prove all the propositions which are carefully chosen and ordered, and are simple enough)". That killed my critical thinking skills and mathematical creativity. I was literally like a machine, give me a question and I could churn out an answer, like a calculator. Each textbook had close to a 1000 exercise. I finished them all. Note that I also never seen the symbol, infinity, in my textbook before entering a U.
But I never understood the concepts behind it. I may be getting full scores for my SAT and A Levels, but only because I am a calculator, not a mathematician. Once you had a non-conventional question to hand to me, my brain will give you an error message. When I attempt a question, I expect a fixed solution for it. I cannot think laterally. Definition-Theorem-Proof-Repeat. I am suffering heavily now at University.
Conclusion? If you are aiming for a society of robot labour (Engineers maybe?), these textbooks are great for pushing students though the system. (Singapore is a country of workers, not thinkers. Look at our research in any field.) If you want a society of thinkers, you need textbooks and Teachers. more orientiated towards understanding.
Do note that I'm assuming proofing encourages critical and creative thinking, which in my opinion, it does.