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 Jan28 awarded Favorite Question Apr9 awarded Popular Question Oct14 awarded Notable Question Jun20 awarded Yearling Jan29 asked If a graph G has chromatic number 3, then G contains a subgraph isomorphic to $K_3$? Jan18 accepted How to define a bijection between $(0,1)$ and $(0,1]$? Dec2 awarded Scholar Dec2 accepted Prove/Show that a number is square if and only if its prime decomposition contains only even exponents. Dec2 accepted How many 4 worded sentences can a list of 5 words make if two of them must be in that sentence? Oct26 awarded Good Question Oct10 awarded Popular Question Aug13 revised How many 4 worded sentences can a list of 5 words make if two of them must be in that sentence? added 294 characters in body Aug1 comment How many 4 worded sentences can a list of 5 words make if two of them must be in that sentence? Repeating "new" and "this" is allowed though. The only problem I currently see with this is that if I get "new this new this" I am counting it twice? or am I missing something? Aug1 asked How many 4 worded sentences can a list of 5 words make if two of them must be in that sentence? Jul6 awarded Supporter Jul5 asked Prove/Show that a number is square if and only if its prime decomposition contains only even exponents. Jun20 awarded Nice Question Jun20 comment How to define a bijection between $(0,1)$ and $(0,1]$? thanks that makes it a lot clear for me. If I was to follow that logic for lets say [0,1]^2 and [0,2]^2 would I solve for [0,1] and [0,2] first by letting A = {0,1} and b = {0,2} and then f: A->B ? Jun20 awarded Student Jun20 asked How to define a bijection between $(0,1)$ and $(0,1]$?