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Apr
22
comment Irrationality of $\pi$ and circumference to diameter ratio.
A better way to write that sum would be $\sum_1^{\infty} \frac {4(-1)^r }{2r-1}$
Apr
20
comment Probability of success in $n$ trials
3. It would make it easier to learn what you are doing wrong and how to improve your asking/answering technique, which would improve the overall quality of posts on the site. What do you think of our proposal?
Apr
20
comment Probability of success in $n$ trials
obvious whether a post is good quality or not. On this site however questions and answers can be somewhat subjective in quality, usually because there are multiple different methods to solving a problem. Therefore, we would suggest that someone who has downvoted an answer must leave a comment at the same time. This would have three advantages : 1. You can make an inquiry as to your downvote. 2. It would not be so lightly and inaccurately voted down, because everybody can see which users have voted down. [cont]
Apr
20
comment Probability of success in $n$ trials
Tone and content looks good but I have some grammatical corrections and a couple of extra additions (I assume English isn't your first language): imulsion and I have seen many times before that responses have been voted down by multiple individuals even though they were mathematically correct - usually without leaving a comment. [insert sources etc here] It is therefore impossible to ask the voter why he has decided that the question is not fit for the site's format - as they cannot be identified from votes alone.On other SE sites this isn't really a problem - it is usually fairly [cont]
Apr
19
comment Simple Logarithmic question.
@Faust7 do you not have access to a calculator? Or is it a non-calculator exercise? You might be able to leave the answer as $\frac{\ln 24}{\ln 9}$ as the decimal is not exact
Apr
19
comment Probability of success in $n$ trials
In terms of solving the problem, there isn't really an easy solution. I like your idea of being forced to leave a comment in order to downvote. Maybe there could be a "why are you downvoting" message box that appears or something, but we can leave that discussion for the post.
Apr
19
comment Probability of success in $n$ trials
I haven't made a post but I do think we need to highlight the somewhat hostile attitude on this site. I'm involved with several SE sites (notably Arqade and SO (check my profile)) and this one definitely feels a lot less welcoming. My ideas: Note in the post how people can downvote for no reason. Use this question as well as others (if you've experienced it before) for sources otherwise no one will believe us. Also look at @Sloan 's answer below. It was downvoted and IMO nothing is wrong with it either. I think the general gist should be that we aren't happy with the situation.
Apr
19
comment Probability of success in $n$ trials
Shall we make a post on meta about this issue?
Apr
19
comment Probability of success in $n$ trials
I upvoted your answer and don't understand the downvote either. It's a valid answer and it works. People seem to be much more vindictive on this site than on other SE sites
Apr
17
comment Probability of success in $n$ trials
To whoever downvoted: Why did you downvote? What makes this question bad? I'd like to improve my asking technique
Apr
17
comment Probability of success in $n$ trials
@GregoryGrant As it turns out, I am extremely stupid. Thank you
Apr
17
comment Solving equations of the form $ae^x + bx +c =0$
I've definitely done it wrong then - my solution has to be positive to make sense in the context of the question. thanks anyway though :)
Apr
17
comment Solving equations of the form $ae^x + bx +c =0$
@Lucian I have $5-12x = 88e^x$. I can solve it easily using the equations function on my calculator (the answer is about $0.303$), but I know that I need to use an algebraic method. As I've said, I've done something wrong. I'm only at A Level and that function is beyond my level of study.
Apr
17
comment Solving equations of the form $ae^x + bx +c =0$
@Lucian See my previous comment. Complex numbers do not make sense in the context of my homework question.
Apr
17
comment Solving equations of the form $ae^x + bx +c =0$
@Lucian Like I say the solution can't be a complex number. I've done something wrong
Apr
17
comment Solving equations of the form $ae^x + bx +c =0$
@PaulPicard Hmm. Well the solution can't be a complex number (since that wouldn't make sense in the context of the question), so I guess I've done something wrong. Thanks anyway :)
Apr
14
comment Finding the partial fraction of $x+21/2(2x+3)(3x-2)$
Have a look at this to format your fractions in MathJax: meta.math.stackexchange.com/questions/5020/…
Mar
10
comment Proving $\sum_{n=0}^{\infty }\frac{1}{(48n+1)(48n+47)}=\frac{\pi}{2208}(\cot(\frac{\pi}{24})+\sec(\frac{11\pi}{24}))$
Could you not split it into partial fractions and find a sum in terms of n using a method of differences?
Feb
22
comment Series question with unknown limit
Thank you for your help :)
Feb
22
comment Series question with unknown limit
@DavidZhang As I understand it you do much more algebra in the US than we do in the UK. I don't ever remember learning that formula outside of FP1 (which is a module only further maths students do)