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  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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#1 Re: Maths Teaching Resources » Logarithm rules and Indices rules » 2014-02-16 05:04:28


Unfortunately, I am unable to post links as the url will disappear after a few minutes.

#2 Introductions » Glad to be back at mathisfun! » 2014-02-16 04:38:36

Replies: 4

I joined this website 9 years ago, and time surely flies! I just graduated with a Math degree, and now am a math tutor in my country.

Really glad to be back at mathisfun. It is a nice website that has withstood the test of time!

#3 Maths Teaching Resources » Logarithm rules and Indices rules » 2014-02-16 04:32:28

Replies: 2

Two page helpsheet and formula list regarding Logarithm rules and Indices rules, with common mistakes to avoid!

#4 Re: This is Cool » Science Books » 2014-02-16 04:20:25


Thanks for the wonderful links!

#5 Re: Help Me ! » Convergence of series » 2014-02-16 04:13:12


The first problem is essentially 5 times the harmonic series, hence, if the harmonic series diverges, so does the first series. smile

#6 Re: Help Me ! » nth derivative (needs computer help) » 2009-09-23 23:09:00


oh its actually because using
(the hint is try on x, x^2, and x^3 first and guess for 2009)
we obtain
9, 18, 27 respectively, suggesting that the number is the 2009th multiple of 9

#7 Help Me ! » Physics/math question! » 2009-09-23 21:54:19

Replies: 0

Hi, I am stuck on this physics question..

#8 Re: Help Me ! » nth derivative (needs computer help) » 2009-09-16 22:40:06


thanks a lot bobbym
i tried using Maple software in my school, and working on the hint, I suspect the answer is 2009x3=18081.

(the hint is try on x, x^2, and x^3 first and guess for 2009)
By the way, which program did u use to test up to f^50?

#9 Help Me ! » nth derivative (needs computer help) » 2009-09-16 16:49:22

Replies: 5

Hi, can anyone help to solve this very challenging problem?

(needs computer help on this)

I tried using many programs but all failed..

the small number (2) is a hint to try x, x^2, and x^3 first and guess the pattern

#11 This is Cool » Excellent free website on physics, light and relativity. » 2006-01-18 23:17:58

Replies: 1

This free site offers information on relativity, light and physics. There is also an award-winning essay titled: "What happens if light slows down to 3000 m/s ?"


#12 Re: Jokes » Thought this was cute... » 2005-11-12 02:24:26


what are the original phrases?
I am not very familiar with foreign languages

#13 Re: This is Cool » My 3D engine: reinventing the wheel » 2005-11-11 00:39:37


this is simply amazing.. try to make a 3d game!

#14 This is Cool » Excellent Book on Relativity and Light » 2005-11-02 01:22:14

Replies: 1

I recommend this excellent book on relativity and light, including an essay titled "What happens if the speed of light slows down to 3000 m/s."

A must for aspiring physicists and mathematicians! Beginners can also read the book as it is self explanatory and easy to understand.

To buy the book, or download the ebook, visit

#16 Dark Discussions at Cafe Infinity » 25 Tips to Beat Anxiety and Depression » 2005-10-29 20:50:37

Replies: 3

Please support me and my new book "25 Tips to Beat Anxiety and Depression"!

You can buy this book at (search for ISBN 1-4116-5666-0) if you are living in the US.

Otherwise, you can buy it from (Search for the title or the author, william wu)

Here is an excerpt of the book:

Description: Studies have shown that approximately one in five adults will suffer from some form of depression or anxiety in their lifetime. This book will focus on non-conventional approaches to solve depression and anxiety, such as using herbal therapies like St John's Wort, 5-HTP, SAM-e, and Valerian Root. Changes to lifestyle and food habits will also be discussed. Professional psychiatrists and psychologists are unlikely to write such a book, so a book by a patient suffering from Anxiety and Depression is ideal, and perhaps the only way. The book will focus on many alternative approaches to help anxiety and depression, other than medication, which can be costly and have many side effects that are not well tolerated. In Singapore, currently there are not many local books on anxiety and depression, which are the two most common psychological disorders, and even fewer on alternative treatments. Good luck in battling anxiety and depression!

This book only costs $10!! Please support me, a faithful member of mathsisfun, and buy this excellent book!

Trust me, you will not waste your money!

#19 Re: Dark Discussions at Cafe Infinity » Asperger's Syndrome » 2005-10-08 02:31:17


try the AQ test, it is very interesting! (under diagnostic tests)

#20 Re: Jokes » Tips to improve your writing » 2005-10-07 00:22:53


this is really a comprehensive list

#21 Re: Help Me ! » Math Study Tips... » 2005-10-07 00:20:28


one more thing -- get enough sleep before the exam, a clear mind is important for maximum concentration

#22 Re: Ganesh's Puzzles » Problems and Solutions » 2005-10-07 00:19:12


wow that was a rather tough one to understand

#23 Re: Dark Discussions at Cafe Infinity » Asperger's Syndrome » 2005-10-05 15:27:15


In the Wikipedia it is called a "A gift and a curse", what are your feelings about it?

i feel that it is really a gift and a curse. Wikipedia put it right exactly.

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