We found that a second-order ideal memristor degenerates into a negative nonlinear resistor. This phenomenon is quite similar to what are observed in chemistry: a chemical element with a higher atomic number is unstable and may decay radioactively into another chemical element with a lower atomic number. After extending the above local activity to other higher-order circuit elements, we concluded that all higher-order passive memory circuit elements do not exist in nature and that the periodic table of the two-terminal passive circuit elements can be dramatically reduced to a six-pointed star comprising only six passive elements. Such a bounded table may mark the end of the hunt for missing higher-order passive circuit elements predicted nearly 40 years ago.

中文翻译：

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仅存在六个无源电路元件

我们发现二阶理想忆阻器退化为负非线性电阻器。这种现象与在化学中观察到的非常相似：具有较高原子序数的化学元素不稳定，可能会放射性衰变成另一种具有较低原子序数的化学元素。在将上述局部活动扩展到其他高阶电路元件后，我们得出结论，所有高阶无源存储器电路元件在自然界中都不存在，两端无源电路元件的周期表可以急剧减少到六-尖星仅包含六个被动元素。这样一个有界表可能标志着寻找近 40 年前预测的丢失的高阶无源电路元件的结束。