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 20m comment How is this limit solved? math.stackexchange.com/questions/597177/… 19h comment Are derivatives eventually periodic? If a derivative becomes periodic you have $f^{(n)}=f^{(n+k]}$. So this is a special form of a linear differential equation. So you should study these differential equations. 1d reviewed Approve How to expand $x_1^3 + x_2^3$ with the parameters of quadratic equation 1d reviewed Reject Index is multiplicative 1d reviewed Approve on the least primitive root of a prime 2d reviewed Reject How to prove that $k^3+3k^2+2k$ is always divisible by $3$? Feb 5 reviewed Approve How to factor $x/(x^2+x+5)$? Feb 5 reviewed Approve parametric equations, finding the range of t Feb 5 reviewed Close Prove that if $f:[a,+\infty [\longrightarrow \mathbb R$ is uniformly continuous, then $\lim_{x\to +\infty }f(x)=+\infty$ Feb 4 comment How to prove that $k^3+3k^2+2k$ is always divisible by $3$? It is always divisible by 2, too. So it is always divisible by 6. Feb 4 revised How to prove that $k^3+3k^2+2k$ is always divisible by $3$? typos Feb 4 awarded Nice Answer Feb 4 revised How to prove that $k^3+3k^2+2k$ is always divisible by $3$? adding a tag Feb 4 answered How to prove that $k^3+3k^2+2k$ is always divisible by $3$? Jan 27 revised $x=2t^3-9t^2+12t+6$ where $x$ is the position of a body at anytime $t$. articles Jan 19 comment How to write a definition of less than $<$? I am not sure if there is a fundamental difference between your answer and my answer but at least you were able to avoid the word "finally". Jan 19 comment How to write a definition of less than $<$? @daOnlyBG Maybe it seems to be concise because it uses not much characters. But you first have to define the + binary operator. The answer of Nephente is similar to this answer but avoids + and uses only the successor operator. Jan 19 comment How to write a definition of less than $<$? @TheChaz: what is wrong with finally? Is it not possible to use this word here? Jan 19 revised How to write a definition of less than $<$? typo Jan 19 comment How to write a definition of less than $<$? @fleablood you are right (I posted an answer that uses this definition). But your comment and my answer also use $\lt$ in its own definition. So I think the comment of TheChaz is not well stated.