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$\begingroup$ This explanation sounds intuitive and reasonable. But some of my analysis must have gone wrong. When I look at the mathematical formula of $\Delta$, I can not find a mathematical deduction of this result. But your explanation makes sense to me. $\endgroup$

Ethan
– Ethan

2017-01-21 18:35:32 +00:00
Commented Jan 21, 2017 at 18:35

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