Question
If $A$ is an uncountable set and $B$ is a countable set, must $A-B$ be uncountable?
Step 1
In other words, we are removing all the elements of $B$ from $A$. Show more…
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Show that if $A$ and $B$ are sets, $A$ is uncountable, and $A \subseteq B,$ then $B$ is uncountable.
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