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 Apr21 awarded Popular Question Sep24 awarded Autobiographer Sep2 awarded Yearling Dec14 awarded Famous Question Sep2 awarded Yearling Apr10 awarded Favorite Question Mar7 revised Is 1+101=110 a proposition? added 200 characters in body Mar7 comment Is 1+101=110 a proposition? I just translated some content of that book to English. See my updated question. Mar7 revised Is 1+101=110 a proposition? added 602 characters in body Mar7 comment Is 1+101=110 a proposition? It's an old Chinese book, that you can't find English verions. Mar7 asked Is 1+101=110 a proposition? Jan7 accepted Is it reflexive: everyone who has visited Web page a has also visited Web page b, for all webpages Jan7 awarded Editor Jan7 revised Is it reflexive: everyone who has visited Web page a has also visited Web page b, for all webpages added 486 characters in body Jan7 comment Is it reflexive: everyone who has visited Web page a has also visited Web page b, for all webpages If page $x$ has never been visited, that $F(p,x)$ will always be false, that $\forall p (F(p,x) \to F(p,y))$ will be true, so $(x, any y)$ belong to $R$. Jan7 comment Is it reflexive: everyone who has visited Web page a has also visited Web page b, for all webpages $R$={$(x,y) | \forall p (F(p,x) \to F(p,y))$}, where $F(p,x)$ means "p has visited x". Is it right? Jan7 asked Is it reflexive: everyone who has visited Web page a has also visited Web page b, for all webpages Jan7 awarded Supporter Jan7 accepted Relation $R$ is $xy\ge1$, and $x\in \mathbb{Z}$ and $y\in\mathbb{Z}$, is $R$ reflexive? Jan6 comment Relation $R$ is $xy\ge1$, and $x\in \mathbb{Z}$ and $y\in\mathbb{Z}$, is $R$ reflexive? @OldJohn,could you please make you comment an answer, and I will accept it? Thanks.