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 Apr9 revised (Edited Duplicate) Let $(x_{n_n})$ be a sequence of positive real number that has no convergent subsequence. Show lim $x_n$ = +$\infty$ deleted 2 characters in body; edited title Mar22 revised When does $az + b\bar{z} + c = 0$ represent a line? Conditions are just enough. Mar21 revised Is continuous and integrable function bounded? English Mar8 revised Show that a finite group with certain automorphism is abelian Adding source. Mar1 revised Why does this converge to $\|x\|$ added 60 characters in body Mar1 revised Why does this converge to $\|x\|$ added 2 characters in body Mar1 revised Why does this converge to $\|x\|$ added 2 characters in body Feb4 revised composition of two measurable function added 4 characters in body Feb1 revised How to prove the following recursive sequence produce relatively prime numbers added 2 characters in body Dec11 revised $\lim_{p\to \infty}\Vert f\Vert_{p}=\Vert f\Vert_{\infty}$? added 5 characters in body; edited title Dec6 revised Prove that $f$ is constant edited title Nov28 revised How do I find the characteristic polynomial and eigenvalues? deleted 4 characters in body Nov26 revised Verifying an equivalence relation Formatting Nov26 revised Verifying an equivalence relation added 7 characters in body Nov13 revised $A\in M_2(\mathbb C)$ and $A$ is nilpotent then $A^2=0$.How to prove this? added 39 characters in body Nov12 revised Suppose $\{f_k\}$ is a sequence of $M$-measurable functions on $X$. Let $p_1$ and $p_2\in [1,\infty)$, and suppose $f_k\in L^{p_1}\cap L^{p_2}$. added 1 character in body Nov12 revised Is there a simpler proof that $f(x,y,z) = 4x + 11y + 18z$ is surjective? Formatting Nov10 revised Composition of measureable function with continuou function in $L^2[0,1]$ Formatting. Nov5 revised Give a counterexample to show that $(AB)^{-1} \neq A^{-1}B^{-1}$ edited title Nov4 revised Prove that g(y)>0 for all y in the real numbers This has nothing to do with proof theory.