May28 comment What should be proved in the binomial theorem? @QiaochuYuan What's the meaning of ${n \choose k} a^k b^{n-k}$? Is it the product $\frac{n!}{k!(n-k)!} \times a^k b^{n-k}$? May28 comment What should be proved in the binomial theorem? @QiaochuYuan Be really cool means that it's in a godlike level of impossibility? May28 asked What should be proved in the binomial theorem? May28 accepted What's so well in having a least element in a set? May28 accepted What's the motivation of the ideal? May28 comment Texas TI-alternatives @Anonymous What ones have you tried? What is a good GUI? May28 accepted Why is the coefficient of $x$ in $\frac{1}{x}=0$? May28 accepted Where to start for studying geometry and what way should I follow after the first step? May28 accepted Is $\sqrt{-1}$ positive or negative? May28 comment Proving that ${n}\choose{k}$ $=$ ${n}\choose{n-k}$ Nevermind. I got it now. May28 asked Proving that ${n}\choose{k}$ $=$ ${n}\choose{n-k}$ May25 comment Show that $S\cap(T\,\cup \,T') = (S\,\cap\,T)\cup(S\,\cap\,T')$ @PeterLeFanuLumsdaine Yes, Peter. The answer is a great addendum to me. It may help me a lot in the near future. May25 comment Show that $S\cap(T\,\cup \,T') = (S\,\cap\,T)\cup(S\,\cap\,T')$ Well, it may help me in the future. May25 comment Show that $S\cap(T\,\cup \,T') = (S\,\cap\,T)\cup(S\,\cap\,T')$ Mathematical hipsters perhaps? May25 comment Show that $S\cap(T\,\cup \,T') = (S\,\cap\,T)\cup(S\,\cap\,T')$ Oh, got it! Thanks Asaf. May25 comment Show that $S\cap(T\,\cup \,T') = (S\,\cap\,T)\cup(S\,\cap\,T')$ Wait. It's an element that is in both $S$ and $(T\,\cup\,T')$. I feel they are the same but I can't explain it. May25 comment Show that $S\cap(T\,\cup \,T') = (S\,\cap\,T)\cup(S\,\cap\,T')$ I'm not sure on how to do that. I'm unable to pick elements in that manner (Can you expand a little?) - but I've made a Venn diagram with it - I do undestand that the Venn diagram is the manifestation of such abstraction (?) but I'm still confused. May25 asked Show that $S\cap(T\,\cup \,T') = (S\,\cap\,T)\cup(S\,\cap\,T')$ May24 revised What's so well in having a least element in a set? edited title May24 comment What's so well in having a least element in a set? Yeah - I'm not really worried with it's name. I was just courious on why this concept was named like this.