Euclid 2 Flashcards
each line is composed of infinite points (of either 0 or finite length). If it’s zero length, then the line has no length (0+0+0+0=0). If it’s finite length, then the line has an infinitely equal amount of finite lengths; therefore infinite in length.
Paradox of Plurality
both odd and even sets of numbers paired one-to-one with natural numbers. the size of the even numbers is the same cardinality as the size of the odd numbers.
Denumerable Sets
There are infinitely many natural numbers; even and odd integers are a subset of them. But these subsets are the same size as the superset. (This wouldn’t be with finite sets)
Strangeness of the Infinite
The length of a line is not determined by the sum of its points. Length is an additional property over and above the points. There’s an additional metric property needed.
Real Lines