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It is exceedingly easy to come up with an original idea. It's much harder to come up with an original idea that is true and correct. It's much much mu 阅读全文
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Theorem: If a minimizer of the fixed ends problem has an isolated $p$ body collision at $t=t_0$, then there is a parabolic homethetic collision-ejecti 阅读全文
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Fundamental Principles of Classical Mechanics, A Geometrical Perspective By Kai S Lam (California State Polytechnic University, Pomona, USA) (World Sc 阅读全文
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1. keep reading some English books. This month The Diary of Anne Frank 2. keep watching interesting videos. Such as positive psychology course from Ha 阅读全文