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 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. Jan 19 revised How to write a definition of less than $<$? added 232 characters in body Jan 19 comment How to write a definition of less than $<$? @TheChaz that can happen in a recursive definition. Jan 19 answered How to write a definition of less than $<$? Jan 17 revised How to find the length of a line in a tetrahedron latax; missing brace added Jan 15 awarded Custodian Jan 15 reviewed Reopen Solve the equation $2φ(x)=x$ for $x\in\mathbb N^+.$ Jan 15 revised Find the number of bicycles and tricycles edited title Jan 13 revised Congruences and prime numbers formulas to latex Jan 12 reviewed Close Given a complete graph of $n$ vertices $K_n$ (has all possible edges – one edge between pair of vertices). Jan 12 comment How to solve instant insanity puzzle with graphs. @SteveKass I related your answer to the question "how can I find the path from the graph I attached".