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visits member for 4 years, 5 months
seen Dec 8 at 10:27

Jul
20
comment Is $.999999999… = 1$?
@ShreevatsaR things changed since I posted the answer...
Feb
17
comment Is $.999999999… = 1$?
@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 $.999999999… = 1$?
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 $.999999999… = 1$?
x to unicode ×, mentioned distribution rule
May
4
comment Is $.999999999… = 1$?
@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.
Jan
19
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.
Jan
19
revised What is the limit as $x\to\infty$ of $\cos x$?
clarify numbers domain
Jan
19
answered What is the limit as $x\to\infty$ of $\cos x$?
Nov
29
revised How to prove DeMorgan's law?
Fixed a typo