Featuring Dr. Stan Wagon Professor of Mathematics – Macalester College. There is no better way to get someone’s attention than with an assertion that just seems obviously wrong. Math is full of such things. The talk presents several surprising even shocking things from elementary mathematics such as: A square wheel that rolls perfectly smoothly. A device that uses a normal rotating crankshaft to drill perfect square holes. An application of a non-circular wheel to sewage disposal. A shocking cake puzzle. Surprising new formulas for π. Benford’s mysterious law of first digits. The Banach-Tarski Paradox with constructible pieces.
教到 second fundamental theorem of calculus：
（其中 在開區間 內連續， 是常數。）
Just a question asked by a student, Thomas.
multiply the above, yield
He puzzled that, why (more…)
我是「數食」者，對飲食不及「八零、九零、零零」後講究。以「飲飲食食」作為學科的包裝／重點（諸如 high tea 學英文之類），常有之。昨早看了「吃你的數學功課」作者的短片：
以下是某道 core math 的題：
Can you draw a triangle with area of 100 , and two of its sides are 10 cm and 16 cm long? Explain briefly.