Elazar Leibovich
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 Jul20 comment Is $.\overline{9} = 1$? @ShreevatsaR things changed since I posted the answer... Feb17 comment Is $.\overline{9} = 1$? @Michael I never evaluate 9*0.9999 at step 3 or at any step. I leave the expression as it is, and then use the fact that if 9x=9 then x=1 in the last step. Jan26 awarded Good Answer Dec15 awarded Popular Question Jul21 awarded Yearling May4 comment Is $.\overline{9} = 1$? Sklivvz, but my answer does not rely on the fact that 8.999...=9, did it? Or am I missing something (tried to make it a bit more clear) May4 revised Is $.\overline{9} = 1$? x to unicode ×, mentioned distribution rule May4 comment Is $.\overline{9} = 1$? @Sklivvz, true, since 8.999....=9. Did you have trouble understanding the algebra I did? Feb21 awarded Nice Answer Feb12 awarded Scholar Feb12 comment Linear Algebra exercises available online? @Klaus, not everyone has accessible math library nearby. But indeed, that would be the best idea. Feb12 accepted Linear Algebra exercises available online? Feb11 awarded Student Feb11 asked Linear Algebra exercises available online? Jan22 comment What is the limit as $x\to\infty$ of $\cos x$? @Jonas, the OP seems to be a beginner in calculus, telling him things like "cos oscillate between 1 and 0", when I'm not sure he grasped the concept of limit might confuse him, or imply him that such answer is an acceptable proof. I wasn't born with calculus book in my hand, so I think trying to help beginners in this site is a good idea. Jan19 comment What is the limit as $x\to\infty$ of $\cos x$? @Theo, my point is, (1) you have to spell out the reason like you did, and I didn't find that in the answers, (2) sometimes the TA wants the answer in an epsilon-delta form. Jan19 comment What is the limit as $x\to\infty$ of $\cos x$? Good point! I think integer or real doesn't really matter. Tried to clarify this issue. Jan19 revised What is the limit as $x\to\infty$ of $\cos x$? clarify numbers domain Jan19 answered What is the limit as $x\to\infty$ of $\cos x$? Nov29 revised How to prove DeMorgan's law? Fixed a typo