#math - Thu 5 Apr 2007 between 00:00 and 00:14

NY Lost Funds



_llll_true but useless
any set is dense in itself...
KampenQ isn't always dense in R :p
depends on the topology
TRWBWi guess you could come up with a definition A is dense in B in C if B is contained in closure of A in C
_llll_it would be Q if it didnt have the subspace topology
s/would/wouldnt/
TRWBWbut it wouldn't be standard
Kampenthe definition of dense i usually use is if A is contained in B, and B is contained in cl(A), A is dense in B
subspace topology?
what's the base for that?
is that the discrete?
TRWBWthat's the induced topology
Kampenah, ok
pirothezerolin. algebra question: change of bases of P C<-B = ( P B<-C)^-1 correct??
TRWBWpirothezero: don't know the notation, but inverting is the right idea
pirothezeroalright cause i am working on this one where i got P B<-C as 2x2 [1,2,4,9] and it says the change is [9,-2,-4,1] but when I run the inverse formula i get [9,-4,-2,1]
godtviskenPi should be equal to the limit as s approaches infinity of (s*sqrt(2-2cos(360/s)))/2 right? i get an accuracy of 7 places when s=9500, but when s=9600 an accuracy of only 6 places. why is this? maybe a limitation of my calculator?
TRWBWpirothezero: you are using odd notation. no one else on the planet who isn't taking the course from your teacher is going to know what you mean unless you define everything
godtvisken: yes, but you can improve that
godtviskenTRWBW: ?
TRWBWgodtvisken: the problem is the 2-2cos, you are substracting two numbers that are almost identical
godtvisken: so you get very little precision, and less precision the bigger n gets
godtvisken: you need to rewrite it using trig identities
godtviskenaha
pirothezerookay the 2x2 matrix notation i put means in [1,2,4,9] first row is 1,2 2nd row is 4,9. And P B<-C means change C to B
benkillinTrig identities are the boss
pirothezerodoesnt seem like that helps a whole lot though
ailndxhttp://library.thinkquest.org/J0110961/2diga.gif is it possible to write like this in latex?
TRWBWpirothezero: what does change C to B mean?
masqueradepirothezero, you might have more luck getting people to understand [[1,2][4,9]] for matrix notation
benkillinOH
!
I get it now
KRUSHGROOVEpirothezero, or you could also write [a,b;c,d]
pirothezerochange of coordinates matrix from B to C
TRWBWpirothezero: you can say that a million things and it doesn't mean anything
godtviskenTRWBW: well, i am using the law of cosine, and assuming the line from the center to the corner of the polygon with n sides is 1 (a circle with a radius of 1 is what the shape should approach)
gordboymaybe the calculation of cos near 0 isn't as good, also
pirothezeromultiplication by P C<-B converts Bcoords into C coords

Page: 2 9 16 23 30 37 44 

IrcArchive

NY Lost Funds