The world will never be the same again after you step into this strange and wonderful garden of thought. And when you look back on this experience many years later, even the things you didn't understand at the time have matured --Samuelson
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Xiang Biao’s 《Crossing Boundaries of Community》 is straightforward and humorous, exploring his research methodology and focusing on new community development models.
Reading of the paper “Logs with Zeros? Some Problems and Solutions”. When the explanatory variable contains 0, the logarithmic transformation log (y+1) has some limitations in estimating treatment effects.
A study note on the calculus of variations based on “Fundamentals of Dynamic Optimization” (Alpha C. Chiang), covering applications such as the catenary problem, the brachistochrone problem, and monopoly pricing.