Problems frequently get easier if you turn them around in reverse. In other words, if you want to help India, the question you should ask is not “how can I help India,” it’s “what is doing the worst damage in India? What will automatically do the worst damage and how do I avoid it?”
数学中的合作是必不可少的;思想的交流导致了任何单一思维都无法独自实现的突破。