# Matemáticos Chibchas

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A shy, neither amateur nor high-class, mathematician from Colombia.

# 625 Actions

 1d reviewed Approve suggested edit on $\frac{dy}{dx}=\cot(x)[\frac{\sin(x)}{y}-\frac{y}{2}]$ Feb19 revised How prove $P(x)=\sum_{k=0}^{n}(2k+1)x^k$ is irreducible over $\mathbb{Q}$ Minor typo, improved formatting Feb17 reviewed Approve suggested edit on The complement of a torus is a torus. Feb12 comment Prove that $(f(x)-x)^2 \not|f( f(…f(x)))) - x$ @user68061 I suppose that you did mean "not all the $g'(a_i)$ can lie on the left half-plane, so $\Re\bigl[g'(a_i)+1\bigr]>1$ for some $i$, and consequently $g'(a)+1$ has norm $>1$, which prevents the equality $\bigl[g'(a)+1\bigr]^n-1=0$". Feb10 comment Prove that $(f(x)-x)^2 \not|f( f(…f(x)))) - x$ @user68061 Shame on you indeed!! just kidding. Now that you confirmed me the validity of the result (along with a proof, thanks!), I have the feeling that the result is true for any field with characteristic $0$ or relative prime to $n$. Feb10 revised Prove that $(f(x)-x)^2 \not|f( f(…f(x)))) - x$ added 336 characters in body Feb10 answered Prove that $(f(x)-x)^2 \not|f( f(…f(x)))) - x$ Feb7 comment example of a basis of $C[0,1]$ Do you mean a Hamel basis? Feb7 reviewed Approve suggested edit on Hausdorff content and Hausdorff measure Feb7 reviewed Approve suggested edit on Borel functions and measurability Feb3 revised Question about convergence of a simple recursive sequence deleted 11 characters in body Feb3 answered Question about convergence of a simple recursive sequence Feb2 revised Proving a particular function is injective Minor typo at the end. Feb2 reviewed Approve suggested edit on Perturbation Sums Question Feb2 reviewed Approve suggested edit on Packing of nodes in a circle Feb2 revised Functional Equation : $f(x) = f(x + y^2 + f(y))$ added 15 characters in body Feb2 reviewed Reject suggested edit on Symmetry of the Riemannian curvature tensor Feb1 comment What properties do we lose when moving from the rational numbers to the real numbers? @JoeZ. $\mathbb Q$, with the usual metric, is totally disconnected; on the other hand $\mathbb R$, with the usual metric, is connected. Feb1 reviewed Approve suggested edit on Effect of approximating a non-differentiable function on optimisation of minimisation Feb1 comment What properties do we lose when moving from the rational numbers to the real numbers? We lose total disconnectedness.