Math 308 Lecture 1 - Introduction to sets

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Hi Professor, Great Lesson. Thanks From BraSil..

fernandoleao
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I am wondering, if the empty set is contained every set (a subset of every set) then why when we find the cardinality of some set A, it does not include the empty set in the size, but when we find the cardinality of P(A) the empty set is then included in the size of that?

octaveoctopus
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what is textbook used for this class ?

abdelrhman
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33:00 "Kids seem to like it."

Apparently the more comments and likes your videos get, the more likely it'll appear on people's recommendation list even if it's by the same person every single time. I don't think that's your intention though, lol.

Wait... a set can get infinitely big however not too big. Seems really vague. Almost like we should've made another word for infinity.

UnforsakenXII