Cryptocurrency exchange

Cryptocurrency transactions are immutable because each block of transactions represents a cryptographic proof (a hash) of all the previous blocks that existed before that. Once someone sends you money, they cannot steal back their payment to you (i.e., no bouncing checks in blockchain). “Smart contracts” built atop these cryptocurrencies do not merely rely on law … Read more

The cofinality of any ordinal α is a regular ordinal, i.e. the cofinality of the cofinality of α is the same as the cofinality of α. Transfinite induction holds in any well-ordered set, but it is so important in relation to ordinals that it is worth restating here. An ordinal is finite if and only … Read more