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Joined: 10 Aug 2003
Posts: 6
Location: CHINA

 Posted: Tue Jan 06, 2004 6:29 am    Post subject: Math is beautiful... hello everybody,i am a college student of mathematic department .Maybe no one feel easy when concerns with this subject,to me,it 's not at all easy,either.But the more i 've learnt about it .the deeper i love it.someone once told me:when you set out to a journey.just stick to it.i think i will not give up easily,and i will hold on and on..._________________contact me with icq:274725107

Joined: 18 Dec 2003
Posts: 76
Location: Barcelona, Spain

 Posted: Thu Jan 08, 2004 9:16 am    Post subject: Yes!!!!! I agree with you. Well, it's not verey difficult, because I'm doing my PhD thesis in Mathematics, so I'm a math-lover too. I'm working in algebraic topology, and you? See you! Lola_________________Para sentir no bastan cinco sentidos...

Joined: 10 Aug 2003
Posts: 6
Location: CHINA

Posted: Thu Jan 08, 2004 5:57 pm    Post subject:

 oinrocinu wrote: Yes!!!!! I agree with you. Well, it's not verey difficult, because I'm doing my PhD thesis in Mathematics, so I'm a math-lover too. I'm working in , and you? See you! Lola

hey,nice to meet you.i've post the topic for a long time but received no reply. i am just a freshman in college and i am studying some basic courses of maths this term.such as algebra and the analyse of mathematic.may be i'll take algebraic topology in the third year .is mathematics popular in your country?

nice day!
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Joined: 18 Dec 2003
Posts: 76
Location: Barcelona, Spain

 Posted: Thu Jan 08, 2004 11:07 pm    Post subject: well, popular... I don't know... No specially popular but it's highly regarded. I finished my degree in Mathematics in 2002 and I studied algebraic topology for 3 years during the degree. Good luck with the analysis and enjoy with the algebra! L._________________Para sentir no bastan cinco sentidos...

Joined: 15 Feb 2004
Posts: 9
Location: Sydney,Australia

 Posted: Sun Feb 15, 2004 12:58 am    Post subject: I am crazy for Maths Hi, my name's Clare.Nice to meet you guy who are math-lover here. I am yr 11 student in Australia. and now i met a little problem that is a 4 Unit (highest level)Maths problem for yr12 student and i want to learn it by myself. I know that you guys will be much clever that I . Thank you for help. Q:How to prove that"sum of the distance from a point of the locus to the 2 foci is constant and dtermine what the constant is(this is for ellispe " " difference from a point of the locus to the foci is constant(this is for hyperbola) " Thank you [/b][/i]

Joined: 20 Feb 2004
Posts: 1
Location: New Zealand

 Posted: Fri Feb 20, 2004 2:36 pm    Post subject: So how do you define an ellispe? My definition of an ellispe is what you want to prove. Tell me your definition and I'll have a try.

Joined: 20 Apr 2004
Posts: 13
Location: China

 Posted: Wed Apr 21, 2004 12:28 am    Post subject: math My second choice is Math when i chosen my department now i am in Computer department but i love math still, no, i love math forever!!!!!_________________hi what's up

Joined: 18 Dec 2003
Posts: 76
Location: Barcelona, Spain

 Posted: Wed Apr 21, 2004 1:07 am    Post subject: ooooooh, what a pity. My choice was Math! In fact, I should be thinking now... What subject do you prefer?I'm topologist_________________Para sentir no bastan cinco sentidos...

Joined: 20 Apr 2004
Posts: 13
Location: China

 Posted: Wed Apr 21, 2004 5:59 am    Post subject: topology I know a little about topology it is so abstract i think i like geometry best and calculous_________________hi what's up

Joined: 20 Apr 2004
Posts: 13
Location: China

 Posted: Wed Apr 21, 2004 6:02 am    Post subject: Barcelona Of all football team in Spain, I like Barcelona best._________________hi what's up

Joined: 29 Jun 2004
Posts: 3

Posted: Tue Jun 29, 2004 4:23 pm    Post subject: Re: topology

 Kerry wrote: I know a little about topology it is so abstract i think i like geometry best and calculous

Hello, Kerry!
I like geometry vety much!!!
Geometry was my specialization at the University.
I had been studying tangent bundles, and what have been studing you?

Joined: 18 Dec 2003
Posts: 76
Location: Barcelona, Spain

Posted: Fri Jul 02, 2004 8:23 am    Post subject: Re: Barcelona

 Kerry wrote: Of all football team in Spain, I like Barcelona best.

Oh...no.... I live in Barcelona, but... And about maths... Topology is abstract?? Noooo, you can take your surfaces, with their holes and play with them. Calculus is abstract, Complex analysis is abstrac, but topology.... is wonderful.
Ok, if you work seriously in algebraic topology, you can do some things a bit abstract, like

\emph{Proof of \ref{cr}}: Let us see that $\liminv_{\F^{cr}} \ch _n (P) = \liminv_{\F} \ch _n (P)$. It is clear that $\liminv_{\F} \ch _n (P) \subseteq \liminv_{\F^{cr}} \ch _n (P)$. Let us see the
other inclusion: We have to show that if we take $P,P'\leq S$ and
$\varphi \in \hom_{\F}(P,P')$, then $\chi_P (p)=\chi_{P'}(\varphi(p))$. By Alperin's fusion theorem, we have
sequences of subgroups of $S$, $P=P_0,P_1,\ldots,P_k=P'$ and
$Q_1,Q_2,\ldots,Q_k,$, with $P_{i-1},P_i \leq Q_i$, and morphisms
$\varphi_i \in \Aut_{\F}(Q_i)$ such that each $Q_i \in \F^{cr}$
and is fully normalized and we can factor $\varphi$ through the
$\varphi_i$s, where each $\varphi_i \in \Aut_{\F^{cr}}(Q_i)$
and takes $P_{i-1}$ into $P_i$. We know that for each $i$,
$\varphi_i \chi_{Q_i}=\chi_{Q_i}$ and, as $P_{i-1},P_i \leq Q_i$, $\chi_{P_i}$ and $\chi_{P_{i-1}}$ are nothing but
restrictions of $\chi_{Q_i}.$

but there are exceptions

And Tanya, there are many bundles in topology. The tangent one is a bit rigid .... but fiber bundles, in general, are quite useful. In fact, my thesis is about this.
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Joined: 29 Jun 2004
Posts: 3

 Posted: Wed Jul 07, 2004 12:59 pm    Post subject: Re: Barcelona Hello everybody! Hello oinrocinu! It's for you! I found geodesics into tangent bundles non-Remian manifolds with curvature is constant. And I find formula for curvature if geodesics is not light-like. I think, geometry for light-like space is very important and very different. It requires new methods.

Joined: 18 Dec 2003
Posts: 76
Location: Barcelona, Spain

 Posted: Tue Jul 13, 2004 10:18 am    Post subject: Does "non-Remian manifolds" mean "non-Riemannian manifolds"? If not, I don't know what is "non-Remian manifolds". Here, in Granada (Spain) there is a quite important research group about minimal surfaces and with constant curvarture. Where do you work?_________________Para sentir no bastan cinco sentidos...

Joined: 29 Jun 2004
Posts: 3

Posted: Sun Jul 18, 2004 4:34 pm    Post subject:

 oinrocinu wrote: Does "non-Remian manifolds" mean "non-Riemannian manifolds"? If not, I don't know what is "non-Remian manifolds".

You are right, thank you.
 oinrocinu wrote: Here, in Granada (Spain) there is a quite important research group about minimal surfaces and with constant curvarture. Where do you work?

I worked in Ukraine. Unfortunately sciences is not very importana for my country. I cannot work now. Now I have been study English for continue work in other country.
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