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 Dec2 comment Show that $\Bbb{Z}/4\Bbb{Z}\times\Bbb{Z}/2\Bbb{Z}\not\cong\Bbb{Z}/8\Bbb{Z}$ @Mj125 Thanks for the quick reply. Dec2 asked Show that $\Bbb{Z}/4\Bbb{Z}\times\Bbb{Z}/2\Bbb{Z}\not\cong\Bbb{Z}/8\Bbb{Z}$ Nov29 revised Expectation regarding Brownian Motion LateX tags Nov29 suggested approved edit on Expectation regarding Brownian Motion Nov27 revised definition of $l$-equivalence screenshot Nov27 suggested approved edit on definition of $l$-equivalence Nov27 comment A noneempty subset $H$ of a finite goup $G$ is a subgroup if and only if $H$ is closed Thank you, I get it now. This is much better. Nov27 accepted A noneempty subset $H$ of a finite goup $G$ is a subgroup if and only if $H$ is closed Nov27 asked A noneempty subset $H$ of a finite goup $G$ is a subgroup if and only if $H$ is closed Nov18 accepted Group(Non-abelian) Multiplication Table Nov18 comment Group(Non-abelian) Multiplication Table @BrianM.Scott I came up with this: $$\begin{array}{ l | c r r r r r } * & e & a & b & c & d &f \\ \hline e & e & a & b & c & d & f \\ a & a & b & e & d&f&c \\ b&b&e&a&f&c&d\\ c&c&f&d&e&b&a\\ d&d&c&f&a&e&b\\ f&f&d&c&b&a&e\\ \end{array}$$ is this correct? Nov18 asked Group(Non-abelian) Multiplication Table Nov18 accepted Order of a group element. [$\operatorname{ord}(x)$] Nov18 asked Order of a group element. [$\operatorname{ord}(x)$] Oct23 awarded Teacher Oct23 comment How can I Prove that $[(p \to\neg q) \wedge q] \to \neg p$ is a tautology? @PeterSmith See Edit Oct23 revised How can I Prove that $[(p \to\neg q) \wedge q] \to \neg p$ is a tautology? edited body Oct23 revised How can I Prove that $[(p \to\neg q) \wedge q] \to \neg p$ is a tautology? edited body Oct23 answered How can I Prove that $[(p \to\neg q) \wedge q] \to \neg p$ is a tautology? Oct23 revised Prove that the function $\Phi :\mathcal{F}(X,Y)\longrightarrow Y$, is not injective. edited title