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 Jan3 reviewed Reject Number of $0$ in great number Jan3 comment questions about probabilistic primality test Which online Rabin-Miller test do you use? Can you provide the link? Jan3 comment How to show result in terms of $\pi$ in Mathcad? @Rory Daulton: No, it is absolutely on topic to pose a question about Mathcad. If it is a question about Mathcad it does not make sense to change it in a question about anything else. I think the post is about symbolic calculation in Matchcad. Jan3 reviewed Approve Question of difficult matrix problem, minimum number of times Jan3 revised How does (wikipedia's axiomatization of) intuitionistic logic prove $p \rightarrow p$? line numbers instead of bullets, makes iteasier to reference Jan2 revised Is $1234567891011121314151617181920212223…$ an integer? removed the invalid "the number" in title Jan2 comment Is $1234567891011121314151617181920212223…$ an integer? I modified the post you referenced becuase it is simply wrong to calll $123\ldots$ a number. Your question title is not posed wll, too. I changed your question tile too, because it contains the invalid assumption that this is a number. Jan2 revised The $2013$th digit of $1234567891011213141516\ldots$ changed "number" to "string" becuase this is not a number Jan2 comment The following is unclear to me:($f$ is the identical function) the inverse of $f: X\to X$ is not continuous(if the second space isnt discrete) The OP contains its (valid) definition of a continous function, so you should write an answer according to this definition and not simply reproduce a standard proof Jan1 comment Show $1+x+(x^2/2!)+ \cdots + (x^n/n!)=0$ has no rational solutions for all $n>1$. you should withdraw the acceptance of this answer. It does not make sense to accept an unvalid answer: The question is now a question with an accepted answer and so nobody who looks for open questions to answer will find it. Jan1 comment Show $1+x+(x^2/2!)+ \cdots + (x^n/n!)=0$ has no rational solutions for all $n>1$. How does the solution that you accepted help you. It stopped there where you already were ($q=\pm 1, p \mid n!$)? Jan1 reviewed Approve What is a function? Jan1 comment Prime Number Sieve using LCM Function The $b_n$ are actually two independent sequences: $$\\ b_{n}=b_{n-1}+\text{lcm}(2n-1,b_{n-1}), n \ge 2, b_1 =2, \text{former even indexes} \\ b_{n}=b_{n-1}+\text{lcm}(2n-2,b_{n-1}), n \ge 2, b_1=2, \text{former odd indexes}$$ a similar sequence: $$b_n = b_{n-1} + \text{lcm}(n,b_{n-1}), n\ge 2, b_1=1$$ oeis.org/A135504 , oeis.org/A217663 Jan1 revised Prime Number Sieve using LCM Function formatted maxima code Dec31 comment Counterexample to disprove that $P(A-B) = P(A) - P(B)$? It is always $$P(A-B) \ne P(A) - P(B)$$ because the lhs contains the empty set and the rhs does not. Dec31 comment A generalized derivative I think it should be $\alpha f(x)^{\alpha-1}\cdot f'(x)\left|\right._{x=x_0}$ Dec31 revised How many zeroes would be there at the end of $11^{(5!)!}-1$? added 30 characters in body; edited tags Dec31 revised How many combinations can a group of n people form? subsets with one elemnt must be excluded Dec31 comment How many combinations can a group of n people form? @Kloar: Yopu are absolutely right, I missed this. I will update the answer. Dec31 answered How many combinations can a group of n people form?