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I was born to answer lhfs.


Apr
12
comment Mathematical Expressions; School Homework
No, I have shown you that it is $7$ step-by-step.
Apr
12
revised Mathematical Expressions; School Homework
added 16 characters in body; edited tags; edited title
Apr
12
answered Mathematical Expressions; School Homework
Apr
12
answered How can I prove that $xy\leq x^2+y^2$?
Apr
7
reviewed Approve suggested edit on Is this sum equal to 1?
Apr
4
comment Trigonometrical limit $\lim\limits_{ x\to 0 } \frac{\sin x - x\cos x}{x^3}?$
@DominicMichaelis Hmm, I think l'Hospital is much more fundamental, so I cannot expect myself to know that before l'Hospital...
Apr
4
comment Trigonometrical limit $\lim\limits_{ x\to 0 } \frac{\sin x - x\cos x}{x^3}?$
But power series involve differentiation. And so does l'Hospital's Rule.
Apr
1
comment Best Fake Proofs? (A M.SE April Fools Day collection)
What if $n = 2$?
Mar
31
comment Evaluate: $\sum_{n=2}^\infty \frac{n(n-1)}{2^{n-2}}$
(+1): Added to one of my most loved answers.
Mar
30
accepted Number of four-term GPs consisting of positive integers under 100: how to write a program
Mar
30
comment Number of four-term GPs consisting of positive integers under 100: how to write a program
Thanks! :-)${}$
Mar
30
comment Number of four-term GPs consisting of positive integers under 100: how to write a program
Your code makes sense, but here's just something you missed: you can reverse your list and that would still be a valid geometric progression.
Mar
30
asked Number of four-term GPs consisting of positive integers under 100: how to write a program
Mar
19
awarded  Fanatic
Mar
7
revised Sequence Notation — Which brackets to use?
the editor is just showing their grammar naziness. corrected minor spelling mistake
Mar
6
comment Show that the sequence $\sqrt{2},\sqrt{2\sqrt{2}},\sqrt{2\sqrt{2\sqrt{2}}},…$ converges and find its limit.
(I wanted to post something different since the proofs are already posted.)
Mar
6
answered Show that the sequence $\sqrt{2},\sqrt{2\sqrt{2}},\sqrt{2\sqrt{2\sqrt{2}}},…$ converges and find its limit.
Mar
3
revised Continued fractions with $n$ layers
better mathjax
Feb
27
comment how to solve nested logarithms
Not much different from what @Babak.S wrote, yet efficient.
Feb
27
answered how to solve nested logarithms