Elazar Leibovich
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 Sep 21 awarded Notable Question Jun 23 revised How to write $\aleph$ by hand Link to the exact time Jun 23 suggested approved edit on How to write $\aleph$ by hand May 26 awarded Great Answer Jul 20 comment Is $0.999999999… = 1$? @ShreevatsaR things changed since I posted the answer... Feb 17 comment Is $0.999999999… = 1$? @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. Jan 26 awarded Good Answer Dec 15 awarded Popular Question Jul 21 awarded Yearling May 4 comment Is $0.999999999… = 1$? 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) May 4 revised Is $0.999999999… = 1$? x to unicode ×, mentioned distribution rule May 4 comment Is $0.999999999… = 1$? @Sklivvz, true, since 8.999....=9. Did you have trouble understanding the algebra I did? Feb 21 awarded Nice Answer Feb 12 awarded Scholar Feb 12 comment Linear Algebra exercises available online? @Klaus, not everyone has accessible math library nearby. But indeed, that would be the best idea. Feb 12 accepted Linear Algebra exercises available online? Feb 11 awarded Student Feb 11 asked Linear Algebra exercises available online? Jan 22 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. Jan 19 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.