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 Jan15 awarded Popular Question Jan3 awarded Supporter Jan3 comment Difference between fields $\mathbb{Q}[\sqrt{2}+\sqrt{3}]$ and $\mathbb{Q}[\sqrt{2},\sqrt{3}]$? Awesome, this makes it much clearer now! Jan3 revised Difference between fields $\mathbb{Q}[\sqrt{2}+\sqrt{3}]$ and $\mathbb{Q}[\sqrt{2},\sqrt{3}]$? added 521 characters in body Jan3 awarded Editor Jan3 revised Difference between fields $\mathbb{Q}[\sqrt{2}+\sqrt{3}]$ and $\mathbb{Q}[\sqrt{2},\sqrt{3}]$? added 521 characters in body Jan3 comment Difference between fields $\mathbb{Q}[\sqrt{2}+\sqrt{3}]$ and $\mathbb{Q}[\sqrt{2},\sqrt{3}]$? Thanks, I see where $sqrt{6}$ comes from then, just I am unsure on what the actual definition of Q[a+b] and Q[a,b] then is. Jan3 asked Difference between fields $\mathbb{Q}[\sqrt{2}+\sqrt{3}]$ and $\mathbb{Q}[\sqrt{2},\sqrt{3}]$? Dec5 comment Proving that crossing number for a graph is the lowest possible I do not think that there is an easy solution. Idea about the forbidden subgraph is a good one, you just gave me inspiration if I could show that that one still has a K3,3 subgraph(K5 is not happening) no matter what edge is removed would be one way. Dec2 answered Existence of a self-complementary graph Dec2 awarded Student Dec2 asked Proving that crossing number for a graph is the lowest possible