Subset Notation

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What is the difference between using ⊂ and ⊆? My book was not particularly lucid on this topic.
 

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What is the difference between using ⊂ and ⊆? My book was not particularly lucid on this topic.
Depends on the author. Usually, the two notations mean the same thing, that is: [itex]A\subset B[/itex] or [itex]A\subseteq B[/itex] means that all elements in A are also in B.

Other authors (but a minority!) use [itex]A\subset B[/itex] to mean that A is a subset of B but A is not equal to B.

You should check your book to see which convention he uses.
 

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