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 Nov 26 comment Expressing Sets as Regular Expressions But maybe this is not availible in your syntax. Nov 26 comment Expressing Sets as Regular Expressions Why do you need this? I means 1 can appear at this position. he usual regular epression syntax is 1? for this. Nov 26 comment Expressing Sets as Regular Expressions Can you explain what is λ? Nov 26 answered Expressing Sets as Regular Expressions Nov 26 comment Expressing Sets as Regular Expressions I think 1. does not match 100. Nov 25 comment What is the probability that he counts head more that tails when tosses a coin 6 times @guest11: you can accept only one answer but I think you can unaccept an answer an accept another one. But you can upvote as many answers as you like. Nov 25 comment What is the probability that he counts head more that tails when tosses a coin 6 times +1 simple , short and can be used for arbitrary number of tosses without increasing the number of calculations Nov 25 revised Is it possible to define $\lceil x\rceil$ in terms of $\lfloor\ldots\rfloor$? changed \le to \lt, otherwise the proof is wrong, typos Nov 24 revised Show that the derivative of a function is not continuous added that g'(0)!=0 Nov 24 comment Show that the derivative of a function is not continuous The special thing is that g' is not continous at 0. Otherwise lim g'(x_n)=g'(0). The word continous appears in the title. there is no reason to repeat it in the body of the message. Nov 24 comment Show that the derivative of a function is not continuous @zhw why do you think your title is more descriptive? Nov 24 answered Simple fraction calculation Nov 23 comment Simple fraction calculation -1, for the error Daiel mentioned Nov 22 comment Tigers and lions attack if they are hungry or threatened. @barak manos: 1)Yes, the downvote is from me. 2) It is up to me to decide if a reason is good enough for a downvote and not to you to decide this. 3) It is not my "personal biological opinion" but it follows from wikis definition of hybrid speciation that these are new species. 4) $\land$ is the intersection of two classes and using these hybrid species makes this less clear and so I do not like it Nov 22 comment Tigers and lions attack if they are hungry or threatened. I think 1. is funny but is wrong. A tigon is neither a tiger nor a lion (that is why it is called tigon). the same is true for ligers. So sentence 1. means: "if something is a tiger and a lion (which is not possible), then ..." Nov 22 comment Prove that $\pi>3$ using geometry How do you want to show something about pi if you have not definition of it? Nov 22 comment Prove that $\pi>3$ using geometry How is pi defined? Nov 20 comment Standard terminology for the “quotient of a quotient” so $q_k =n \mod m^{k+1}$ Nov 20 comment Show that the derivative of a function is not continuous you get $g'(x_n)= \frac{4}{\frac{\pi}{3}+ 2n\pi}\sin (\frac{\pi}{3}+ 2n\pi)$. This converges to $0$ Nov 20 revised Show that the derivative of a function is not continuous changed title