Скачать или смотреть A Simple Explanation of Set Theory

This video has Barb Bernstein explaining some basic concepts in Set Theory, a branch of Mathematics.
The material below reviews and extends the ideas that are presented...

Q: What is a set?
A: A set is a collection of things.

Q: What do we call the things in a set?
A: We call each one an "element" of the set.

Q: What kind of things can be in a set?
A: Anything can be an element of a set. You can have a set of flowers, or a set of breakfast foods, or a set of "school rules," etc.

Q: What is the difference between "combinations" and "permutations" in set theory?
A: A combination is just a list of some elements from a set. But permutations refer to how those elements are ordered. For example, suppose you have the set of people on a baseball team. You can list a group of them that play in the outfield. This would be a combination of players from the team, and the order they are listed in wouldn't matter. But if you list the first four players by their batting order, you have a list where the order does matter. That would be a specific permutation of the players who are listed.

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Lunar Cars & Magic Words is a children's book adventure that introduces the ideas in set theory. For info, visit Wiseoldowlbooks.com