CRASH COURSE #4 - Special Sets and Intervals (continued)

This is part 2 of the "crash course" in special sets and intervals. We cover real numbers, interval notation, alternate representations of the real line, and subsets of the real line.
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[@Joe-un1tl]

Amazing series so far. Set theory is extremely useful for pure and applied math. Can’t wait for more.

[@01k]

To expand on your analogy, the open interval has electric fences

[@marypower1261]

Some irrational numbers only exist because we (humans) can play with symbols...