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- 41 "Negative" versus "Minus"
- 32 If $\gcd(a,b)=1$, then $\gcd(a^n,b^n)=1$
- 30 Are the axioms for abelian group theory independent?
- 26 Is $\{\emptyset\}$ a subset of $\{\{\emptyset\}\}$?
- 25 Prove that every element of a finite group has an order
- 23 Prove/Disprove that if two sets have the same power set then they are the same set
- 22 $\{1,1\}=\{1\}$, origin of this convention
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