How are memristors modeled in terms of impedance?

I have been searching the net for memristors, but could not get much of an idea. I'm not interested in how memristors are made (by combining materials), (yet), because I first want to understand what they do, compared to classical RCL components.

I had a look at https://en.wikipedia.org/w/index.php?title=Memristor&oldid=757282109 (intentionally linked to the version I have read), but this left me more than confused. There, I didn't even recognize some formulas for RCL components.

Then I saw Why does electrical impedance have as many parameters as it has? and the answer https://physics.stackexchange.com/a/187301 , which does not explain about how memristors are modeled in terms of impedance.