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 55m comment Let $A⊆X$ and $A$ is convex, close ,absorbing. Is this true that $A$ everywhere dense in itself? 1h revised A pretty hard limit deleted 33 characters in body 1h answered Inequality Solution Set 2h comment How many ways can you select $5$ students from a line of $20$ so that no two sit side by side? Hi and welcome to the site! Since this is a site that encourages and helps with learning, it is best if you show your own ideas and efforts in solving the question. Can you edit your question to add your thoughts and ideas about it? 3h comment Is the difference between two odd integers (or an odd and an even one) odd? Hi and welcome to the site! Since this is a site that encourages and helps with learning, it is best if you show your own ideas and efforts in solving the question. Can you edit your question to add your thoughts and ideas about it? 3h revised How do I find a relation for these polynomials from a matrix? deleted 72 characters in body 3h comment volume of 3 prisms (one is one third the other and 2 are equal) Hi and welcome to the site! Since this is a site that encourages and helps with learning, it is best if you show your own ideas and efforts in solving the question. Can you edit your question to add your thoughts and ideas about it? 3h revised rewrite in a mathematical format added 292 characters in body 3h comment How many recursive calls are made when quicksort is size n Hi and welcome to the site! Since this is a site that encourages and helps with learning, it is best if you show your own ideas and efforts in solving the question. Can you edit your question to add your thoughts and ideas about it? 3h answered If a set is compact then it is closed 4h answered Prove that the image of a curve has zero content 4h comment Calculate occurance of a digit in average You recieved 2 answers 4 hours ago. Are they what you need? If so, accept one of them. If not, explain what the problem is. 4h comment What's the significance of the Church-Turing Thesis? As far as I can see, the thesis is not importand because of its definition, but because it provides a bridge between the real world, where functions are effectively computable or not, and the theoretical world of mathematics, in which we have a strict definition of what "computable" means. 4h comment How is Z$/n$Z isomorphic to Z$_n$? To me $\mathbb Z_n$ is defined as $\mathbb Z/n\mathbb Z$. 4h comment Radius of convergence problem. @RohitDuggal I did, 11 minutes ago. $11$ minutes is not enough time for you to properly think about things, so I will not provide further hints. You got the problem in order to learn. If I tell you the result, you learn nothing. Take a look at the problem, take a look at the textbook you have, see how similar problems were solved in the textbook, and try several things. Most will fail. That is how you learn. 4h comment Radius of convergence problem. @RohitDuggal No, because $a_n$ may not have a limit. 4h comment Convergence of an infinite logarithmic series. Did you try the standard tests? (ratio test, for example)? 5h comment Radius of convergence problem. @RohitDuggal Well, you need a similar inequality. Try to remember what $\limsup$ is. 5h answered Radius of convergence problem. 6h revised Is $\sqrt{x}$ uniformly continous in $\mathbb{R}^+$? added 3 characters in body