What it means to put it mathematically is that, if you're concerned about a society today, you should be looking not at the value of the mathematical function -- the wealth itself -- but you should be looking at the first derivative and the second derivatives of the function. That's one general theme. A second general theme is that there are many, often subtle environmental factors that make some societies more fragile than others. Many of those factors
数学的に表現するとこうなります もしあなたが 今日の社会を憂慮しているなら 数学的な関数の値 すなわち富そのものではなく 1次微分と2次微分に注目すべきでしょう これが共通項の一つ目です 共通項の二つ目は環境の要因です　多くの複雑な環境要因が ある文明社会を他の社会より脆弱にしますが