# Unknown German Retiree Proved The “Gaussian Correlation Inequality” Conjecture

https://www.wired.com/2017/04/elusive-math-proof-found-almost-lost

$\boxed {P (a + b) \geq P (a) \times P (b)}$

Case “=” : if (a, b) independent
Case “>” : if (a, b) dependent

Thomas Royen used only high-school math (function, derivative) in his proof in 2014. He then published it in arxiv.org website – like Perelman did with the “Poincaré Conjecture”.

# Fun Math Without Math

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See clearer if change person to taxi car, bun to passenger.

9 taxi cars send 9 passengers will take the SAME timing as 3 taxi cars send 3 passengers.

[INMO 1993]

# QS University Ranking 2017 by Math Subject

This ranking has criteria which are quite subjective, eg. Employer reputation (depends on individual country, local employment for Math graduates, job opportunities), also Citations refer predominantly to English publications which are not in favor of non-English speaking countries like China, Japan, France, etc.

If by real substance of Math education for Mathematicians, the 32th Ecole Normale Supérieure (Paris) – the alma mater of Evariste Galois – should be ranked among the Top 3 in the World, having produced 1/3 of the Fields Medals (Nobel Prize equivalent in Math) by a single country and a single university.

Top 5:

1. MIT
2. Harvard
3. Stanford
4. Oxford
5. Cambridge

18. University of Tokyo

20. Peking University 北京大学

22. Ecole Polytechnique (France)

26. TsingHua University 清华大学

28. Hong Kong University

32. Ecole Normale Supérieure (Paris)

# 苏联老师Arnold 如何 教中小学 抽象”群”

How this Russian math prof taught secondary school kids the advanced math in Group & Field Theory without the boring axiomatic approach which tortures most math students.