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/sci/ - Science & Math

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4256724 No.4256724 [Reply] [Original]

Putnam/IMO problem of the day from

http://www.math.harvard.edu/putnam

By reading it, you must attempt to solve it.

>> No.4256736
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4256736

EK

>> No.4256743

>by reading it, you must attempt to solve it

>mfw that's what I said when I posted the first one of these

>> No.4256748

>>4256743
The /sci/ mod *has* been proven to have zero originality, as shown by him using nearly the exact same ban message ("inane trolling garbage" or a close variant) each of the the 8 zillion times a day he decides someone needs to be banned.

>> No.4256754 [DELETED] 

>>4256748
>4chan has only one mod

>> No.4256766

>>4256748
I agree. The /sci/ mod is a real cumguzzler.

>> No.4256796

Is there an archive of these problems? I wanna take a look at the old problems of a day but I cant find 'em on the site.

>> No.4257056

>>4256748
Hahaha, why on earth should he waste more energy on you than he already is, we should be happy that he bothers with you scum. What kind geek trash expects a personalized ban message? I'm pretty sure you don't contribute anything positive so please leave and never come back!

>> No.4257063

>>4256748
But that's not the mod you useless piece of shit. People post putnams and the mod stickies them, he doesn't post them himself.

>> No.4257100

>>4257056
Sorry, I can't hear you over the mod's dick in your mouth.

>> No.4257114

>>4257100
This has nothing to do with the mod, I don't really know what he does if anything but anyone who annoys you must be doing something right.

>> No.4257178

It's algebraicly reducible to (a^x)(b^(1-x)) = (a - be^u)sinh(ux)/cosh(u)

Any ideas for the next step?

>> No.4257203

>>4257178
you mean you're not just too lazy?
The reasonning is pretty clear here:
you study the function of x defined by one of the sides minus the other, you find the extremal values that meet the conditions as a function of a and b, you can then obtain your c.

>> No.4258183

Is anyone on /sci/ an actual graduate student at one of the top universities? (stanford, harvard, MIT...)

just curious

>> No.4258423 [DELETED] 

>>4258183
you rang?

>> No.4258508

>>4258183
If that counts, I come from the school at which all of the ten French laureates of the Fields medal studied (hence the school that taught most Fields medal laureates, I think). I did computer science and not maths though, and the school ranks weirdly in international rankings due to its small size per subject and vast number of subjects, as well as the fact that research is never done in the school itself but in universities that collaborate with the school itself, and also that it is the best school to go to if you want to be a high school teacher in a good high school, and people who do that don't publish papers or anything, which doesn't account well for the fact that they are usually still great in their subject.

>> No.4258589

>>4258508
vive l'ENS?

>> No.4258633

oh god this is making me cringe i feel stupid

>> No.4258645

>>4258589
Indeed.

>> No.4258708

>>4258508
>>4258645
Ulm, Lyon ou Cachan?

>> No.4258711

>>4258589
>>4258645
>>4258708
why are there so many French students in here?

>> No.4258723

>>4258708
Cachan (Ker-Lann actually). Won't tell from which year because considering that comp science in Ker-Lann has from 5 to 10 students per year, it would get too close to me for 4chan.

>> No.4258738

>>4258508
>faire l'ENS pour enseigner dans un lycée
>2012
J'espère sérieusement que vous ne faites pas ça, les gars. Il n'y a rien de plus ennuyeux que d'enseigner comment tracer une fonction linéaire.

>>4258711
Because the French education system is fucked up and like no other. In France, when people have good marks in math/physics, they get into special schools with special teachers for an intensive 2-year-long learning program in math, physics, chemistry, engineering and/or computer science. The courses are typically those of an average undergrad in the US; they can tackle Putnams/IMOs without thinking "what the fuck am I reading". At the end they have hard exams whose results will determine what schools (called "grand ecoles" or "engineering schools") they get to study in. People willing to cope with such heavy doses of math and physics are typically nerds, and thus are more likely to browse 4chan. Here's your answer.

>> No.4258750

>People willing to cope with such heavy doses of math and physics are typically nerds

Oh come on, I know you also found the most normal people on earth in prepa too :D

>> No.4258749

>>4258723
Le nombre de prépas et d'intégrés sur 4chan est suffisamment élevé pour que personne ne te regarde avec un air de dégout; personnellement je connais au moins six personnes qui y vont, cinq étant des prépas et/ou intégrés.

>> No.4258783
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4258783

>>4258750
Alors il y a deux catégories: ceux qui vont en prépa parce qu'ils ont des bonnes notes au lycée et on leur a dit que c'était bien, et ceux qui y vont parce qu'ils aiment les maths et la physique. Sans aucune considération de niveau, les premiers galèrent et stressent, ont plus de chance d'arrêter en sup et sont typiquement ceux qui veulent à tout prix intégrer en spé. Alors certes, j'en connais plein qui sont à l'X ou à Centrale Paris parce qu'ils sont suffisamment forts malgré tout. Mais la plupart des prépas sont quand même des nerds, faut l'avouer. Quant aux ENS, personne de "normal" n'est à la fois capable et désireux de les intégrer. Je peux me tromper, mais je me base sur ce que j'ai constaté et ceux que je connais, il se peut que mon expérience soit trompeuse.

>> No.4258786
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4258786

>>4257203
>2012
>trying to solve inequalities by minimizing functions with derivatives

Here's every putnam problem ever, with the answers:

http://mks.mff.cuni.cz/kalva/putnam.html

Find me a single inequality problem from any test where that's ever worked.

>> No.4258844

>>4258786

I found three. (This isn't one of them.)

>> No.4258942

>>4258738
>J'espère sérieusement que vous ne faites pas ça, les gars. Il n'y a rien de plus ennuyeux que d'enseigner comment tracer une fonction linéaire.

Yeah I didn't really advise anyone to do that. I did ENS in comp science, there's no agregation in comp science and (currently) no comp science teachers in high schools, so obviously I'm here for research (could be for university teaching or for going to the industry though). And yeah, I agree that French prepa is probably higher level than the average foreign "good" university for those 2 years. Unfortunately I think that unless you join a really really good school after prepa, this isn't true anymore afterward...

>> No.4259189

>>4258786
implying I care about solving it in the most beautiful way

>> No.4259203

>>4257056 confirmed for suck-up

>> No.4259387

The answer's 37. Trust me.

>> No.4259553

>>4259387
I'd believe you. You seem trustworthy.