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dj so orz
by
Yiyj1, Mar 29, 2025, 1:42 AM
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legendary problem writer
by
Clew28, Jul 29, 2024, 7:20 PM
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orz
by
balllightning37, Jul 26, 2024, 1:05 AM
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hi dj
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OronSH, Jul 23, 2024, 2:14 AM
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i wanna submit my own problems lol
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ethanzhang1001, Jul 20, 2024, 9:54 PM
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hi dj, may i have the role of contributer?
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lpieleanu, Feb 23, 2024, 1:31 AM
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This was helpful!
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YIYI-JP, Nov 23, 2023, 12:42 PM
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waiting for a recap of your amc proposals for this year
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ihatemath123, Feb 17, 2023, 3:18 PM
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also happy late bday man! i missed it by 2 days but hope you are enjoyed it
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ab456, Dec 30, 2022, 10:58 AM
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Contrib?
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MC413551, Nov 20, 2022, 10:48 PM
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tfw kakuro appears on amc
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bissue, Aug 18, 2022, 4:32 PM
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Hi dj
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799786, Aug 10, 2022, 1:44 AM
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Roses are red,
Wolfram is banned,
The best problem writer is
Djmathman
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ihatemath123, Aug 6, 2022, 12:19 AM
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hello
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aidan0626, Jul 26, 2022, 5:49 PM
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Do you have a link to your main blog that you started after graduating from high school, I couldn't find it. @dj I met you IRL at Awesome Math summer Program several years ago.
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First, Mar 1, 2022, 5:18 PM
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how did you do that cursor
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mathgenius64, Sep 1, 2011, 10:14 PM
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Finally posted that problem! And hooray for pencil cursor!
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djmathman, Aug 24, 2011, 6:49 PM
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Geo 2 is correct though
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sjaelee, Aug 24, 2011, 12:21 AM
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Hello...Lol yesterday sjaelee posted Geomretry #2. Isn't it supposed to be Geometry #2? Lol.
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mcqueen, Aug 23, 2011, 11:57 PM
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Delete geo #4! Plese!
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sjaelee, Aug 22, 2011, 11:41 PM
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Hrm, there's this problem that I've been too lazy to post. I think I should soon.
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djmathman, Aug 22, 2011, 7:02 PM
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Why hello...funny I'm saying this when I know you'll be unresponsive because you're V/LA for a week.
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mcqueen, Aug 14, 2011, 10:47 AM
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But that's because those problems are the easiest to find.
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djmathman, Aug 12, 2011, 3:49 AM
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Yea, I kind of keep forgetting to change that.
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djmathman, Aug 11, 2011, 11:27 AM
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I noticed that only algebra and number theory come up
(trig was basically algebra)
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sjaelee, Aug 11, 2011, 11:22 AM
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There you go.
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djmathman, Aug 7, 2011, 2:07 PM
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*cough* contrib
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Mrdavid445, Aug 7, 2011, 12:40 PM
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Ah, i'm sure you will use this blog well.
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tc1729, Aug 7, 2011, 2:10 AM
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First shout!
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djmathman, Aug 5, 2011, 6:58 PM
by sjaelee, Aug 28, 2011, 6:36 PM ![\[ S =\sqrt{1+\frac{1}{1^{2}}+\frac{1}{2^{2}}}+\sqrt{1+\frac{1}{2^{2}}+\frac{1}{3^{2}}}+\cdots+\sqrt{1+\frac{1}{1999^{2}}+\frac{1}{2000^{2}}}. \]](//latex.artofproblemsolving.com/0/4/a/04a2b824ff27e3de58e0c34da0818cf0a8e28dcc.png)
![\[ S =\sqrt{1+\frac{1}{1^{2}}+\frac{1}{2^{2}}}+\sqrt{1+\frac{1}{2^{2}}+\frac{1}{3^{2}}}+\cdots+\sqrt{1+\frac{1}{1999^{2}}+\frac{1}{2000^{2}}}. \]](http://latex.artofproblemsolving.com/0/4/a/04a2b824ff27e3de58e0c34da0818cf0a8e28dcc.png)
:
. Expanding messily,
. I looked at it this way:
. This means
. Letting 
and 
gave a solution (yay!), so
.
):
terms, so 
that can be paired for one, so 
. Then,
is desired. 
.
April 2025
November 2024