Several natural phenomena are ruled by the same first-order differential equation. Curiously, the Friedmann equation of relativistic cosmology is of the same form, allowing for useful analogies to be built. Several applications of this equation to phenomena occurring in nature are presented.

中文翻译：

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用相同的方程式描述的自然现象

相同的一阶微分方程决定着几种自然现象。奇怪的是，相对论宇宙学的弗里德曼方程具有相同的形式，可以建立有用的类比。提出了该方程对自然发生的现象的几种应用。