Im confused about this, could someone please explain the answer.
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Originally Posted by swedxc Im confused about this, could someone please explain the answer. $\displaystyle A=\{1\}\,,\,B=\{\{1\}\,,\,\,1\}$ Tonio
You could also use $\displaystyle A = \emptyset, B = \{\emptyset\} $. Then, $\displaystyle \emptyset \in B $ and, since $\displaystyle \forall C, \emptyset \subseteq C $, we can say that $\displaystyle \emptyset \subseteq B $. Hope this helps!
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