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14
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Mar
5
asked
Continuity Properties
Dec
12
answered
Prove equivalence $(P \Rightarrow Q) \land (P \Rightarrow R) \Leftrightarrow P\Rightarrow(Q\land R)$
Dec
10
asked
How do mathematicians think about the existence of numbers?
Dec
10
answered
Need help with simple proof by mathematical induction
Dec
9
asked
left regular representation of $G$ with respect to $g$
Dec
9
asked
prove that $\text{lcm}(\text{lcm}(a,b),c)=\text{lcm}(a,\text{lcm}(b,c))$
Dec
2
asked
An abelian group is not isomorphic to an non-abelian group.
Dec
2
asked
Show that $\Bbb{Z}/4\Bbb{Z}\times\Bbb{Z}/2\Bbb{Z}\not\cong\Bbb{Z}/8\Bbb{Z}$
Nov
27
asked
A noneempty subset $H$ of a finite goup $G$ is a subgroup if and only if $H$ is closed
Nov
18
asked
Group(Non-abelian) Multiplication Table
Nov
18
asked
Order of a group element. [$\operatorname{ord}(x)$]
Oct
23
answered
How can I Prove that $[(p \to\neg q) \wedge q] \to \neg p$ is a tautology?
Oct
22
asked
Prove that the function $\Phi :\mathcal{F}(X,Y)\longrightarrow Y$, is not injective.
Oct
9
asked
Proving $\sum_{i=1}^{n}{\frac{i}{2^i}}=2-\frac{n+2}{2^n}$ by induction.
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