Artem Oboturov
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 Sep24 awarded Autobiographer Aug17 comment Explicit solutions for advection-diffusion PDEs What about boundary conditions? Aug10 asked Explicit solutions for advection-diffusion PDEs Jul30 comment A bijective mapping from $\mathbb N^k$ to $\mathbb N$? This is a constructive solution which I could use in a computer program, as I intended to. Jul30 awarded Student Jul30 comment A bijective mapping from $\mathbb N^k$ to $\mathbb N$? @dtldarek I didn't notice at first, that you have linked to a question with your proposal, I'm on it now. Jul30 revised A bijective mapping from $\mathbb N^k$ to $\mathbb N$? edited title Jul30 comment A bijective mapping from $\mathbb N^k$ to $\mathbb N$? @dtldarek : your answer will require $k$ colours to be used. I have an additional requirement : only one colour should be used. Is this enough as a structure? Jul30 awarded Commentator Jul30 comment A bijective mapping from $\mathbb N^k$ to $\mathbb N$? @dtldarek : propose it and you will get the score. Jul30 comment A bijective mapping from $\mathbb N^k$ to $\mathbb N$? @IttayWeiss dtldarek is correct. Jul30 comment A bijective mapping from $\mathbb N^k$ to $\mathbb N$? @EricStucky you're right, I'm looking for a bijective mapping. There's no algebraic structure whatsoever. Jul30 revised A bijective mapping from $\mathbb N^k$ to $\mathbb N$? deleted 2 characters in body Jul30 asked A bijective mapping from $\mathbb N^k$ to $\mathbb N$? Jun9 awarded Supporter Oct24 awarded Editor Oct24 comment Inner products equality for one of vectors fixed @RahulNarain the inner product. I did the edit. Oct24 revised Inner products equality for one of vectors fixed edited body; edited tags; edited title Oct23 comment Inner products equality for one of vectors fixed @RahulNarain seems it is you who should get a credit for an answer. Are there any conditions to be imposed on $u$ and $v$ so that implication would be true? Oct22 comment Inner products equality for one of vectors fixed You can provide counter-examples to support your claim.