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1d
comment Rewrite trigonometric expression to be be numerically “stable”
Yes, I would prefer a formula which is exact and which is defined at x=0. But maybe such a formula does not exist...
1d
comment Rewrite trigonometric expression to be be numerically “stable”
Yes, this is nice! However I need to apply this formula also for "non small" values of $x$. I think I could use $x/3$ when $|x| < 0.01$ and the exact formula elsewhere...
1d
revised Rewrite trigonometric expression to be be numerically “stable”
added 134 characters in body
1d
comment Rewrite trigonometric expression to be be numerically “stable”
Yes, I could use Taylor series, but I should distinguish the case when x is not small... that I would like to avoid.
1d
asked Rewrite trigonometric expression to be be numerically “stable”
May
21
answered Can I prove Pythagoras' Theorem using that $\sin^2(\theta)+\cos^2(\theta)=1$?
May
18
revised Affine Independence $\iff$ Linearly Independent
deleted 1 character in body
May
2
comment About Banach Spaces And Absolute Convergence Of Series
You are right! I have corrected it....
May
2
revised About Banach Spaces And Absolute Convergence Of Series
added 13 characters in body
Apr
8
comment Riddle: 1 question to know if the number is 1, 2 or 3
Since the girl knows EVERYTHING about number 1, she knows if the boy is thinking to that number...
Apr
7
awarded  Necromancer
Apr
6
asked Nice application of fixed point theorems
Mar
14
answered Help understanding the proof for the infinity case of L' Hopital's Rule.
Mar
14
revised Prove that $ n^2$ tends to infinity as $n$ tends to infinity
added 6 characters in body
Mar
14
answered A 'different' explanation to “Supremum”
Mar
14
answered Prove that $ n^2$ tends to infinity as $n$ tends to infinity
Feb
18
comment Uniform convergence and bounded increasing function.
Take the functions $f_n(x) = |\sin n| x$. These are increasing functions which do not converge as $n\to \infty$.
Feb
15
revised Proving that lines from any vertex of a parallelogram to the midpoints of the opposite sides trisect a diagonal
added 64 characters in body
Feb
15
answered Proving that lines from any vertex of a parallelogram to the midpoints of the opposite sides trisect a diagonal
Feb
14
answered Proof that the $\lim\limits_{x \to 2}\dfrac{1}{x} = \dfrac{1}{2}$ using the $\epsilon$-$\delta$ definition of limits (verification).