$$\bex \sin(x+y)=\sin x\cos y+\cos x\sin y. \eex$$ Ref. [Proof Without Words: Sine Sum Identity, The College Mathematics Journal].
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其他好文 时间：
2014-11-19 12:19:11
阅读次数：
575
$$\bex \frac{\sin x}{x}\nearrow. \eex$$ Ref. [Proof Without Words: Monotonicity of $\sin x/x$ on $(0,\pi/2)$, The College Mathematics Journal]
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其他好文 时间：
2014-11-19 12:12:31
阅读次数：
152
Prime Distance
Time Limit: 1000MS
Memory Limit: 65536K
Total Submissions: 12811
Accepted: 3420
Description
The branch of mathematics called number theory is about p...
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其他好文 时间：
2014-11-12 13:51:21
阅读次数：
248
Description
The branch of mathematics called number theory is about properties of numbers. One of the areas that has captured the interest of number theoreticians for thousands of years is the qu...
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其他好文 时间：
2014-11-05 00:33:10
阅读次数：
200
You have to think about mathematics every waking moment!---Ky Fan本文转载自''樊畿---为数学而生,数学乃是他的生命, 数学进展, 第40卷第1期, 2011年, 1-10.
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其他好文 时间：
2014-11-01 08:36:26
阅读次数：
391
DescriptionIf We Were a Child Again “Oooooooooooooooh! If I could do the easy mathematics like my school days!! I can guarantee, that I’d not make any...
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其他好文 时间：
2014-10-25 15:49:38
阅读次数：
316
Coder
Time Limit: 20000/10000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 3327 Accepted Submission(s): 1316
Problem Description
In mathematics a...
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其他好文 时间：
2014-10-18 22:26:54
阅读次数：
293
Background
Some concepts in Mathematics and Computer Science are simple in one or two dimensions but become more complex when extended to arbitrary dimensions. Consider solving differential equations...
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其他好文 时间：
2014-10-17 22:01:08
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231
Known Notation
Time Limit: 2 Seconds Memory Limit: 65536 KB
Do you know reverse Polish notation (RPN)? It is a known notation in the area of mathematics and computer science. It is also k...
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其他好文 时间：
2014-10-16 03:40:51
阅读次数：
191
DescriptionDo you know reverse Polish notation (RPN)? It is a known notation in the area of mathematics and computer science. It is also known as post...
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其他好文 时间：
2014-10-16 00:15:21
阅读次数：
587
