Quote:
Originally Posted by jbjb
Minor clarification - Nand *or* Nor is all that's needed. Either will do, you don't need both.
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True, but simpler to have both at the component level. Similarly while And and Or are basic operations real devices use Nand and Nor (Valves, RTL, TTL, CMOS etc). It doesn't matter to relay logic if the contacts are the change over type.
https://en.wikipedia.org/wiki/De_Morgan%27s_laws
https://en.wikipedia.org/wiki/Logic_optimization