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<Manyfold> i have no books and can not read
<Prof_Vince> then wait for your teacher's course about it
<JabberWalkie> Manyfold: if you cant read how do you use irc.....or a computer for that much :P
<Manyfold> well my computer reads it for me
<JabberWalkie> ohhhh ok
<JabberWalkie> i have a computer that can do my dishes and take out the trash....
<trash> wahh!
<alindeman> Hi all, how would I solve 9*exp(x) - exp(2x) = 20 for x?
<integral> it's a quadratic in exp(x)
<alindeman> Oh, wow, didn't notice that
<Dreadshoot> @math Solve[9*Exp(x) - Exp(2x) == 20, x]
<mbot> Dreadshoot: {{x -> 20/(7*Exp)}}
<alindeman> (exp(x) - 4)(exp(x) - 5) ...
<alindeman> Kewl ...
<alindeman> Thanks integral
<integral> np
<JabberWalkie> so let r be the rank of a matrix C.....and let a be the rank of C*C then r>=a.....correct?
<JabberWalkie> i dont really know how to proove this
<JabberWalkie> some hints would be nice
<lillpelle> tip: it is enough to show that the dimension of the nulspace of C*C is >= the dimension of the nullspace of C.
<JabberWalkie> ok,,,,
<lillpelle> but that is easy, since if Cv=0, then C*C*v=0, so the nullspace of C*C is included in the nullspace of C
<lillpelle> then use the rank theorem
<lillpelle> or what it could be called
<JabberWalkie> ive already show that the null space of C is a subset of the nullspace of C*C
<JabberWalkie> that was easy
<JabberWalkie> ok ill have to look that up
<JabberWalkie> thanks
<lillpelle> yw
<kurij> how many possible numbers can a 16 digit number handle?
<kurij> if each digit can be 0 - 9
<kurij> 16^10?
<JabberWalkie> -1
<TheBlueWizard> 10^16 possible digits
<TobiasFar> why -1?
<JabberWalkie> feels right :P
<TobiasFar> the maximum number is -1
<TobiasFar> lol
<JabberWalkie> 10^16 also feels right :P
<JabberWalkie> found some equation that says dim(N(A))+rank(A)=n
<salamandyr> can anyone suggest a good book / website / tutorial on doing wavelet analysis of continuious data?
<JabberWalkie> nope
<salamandyr> heh
<TheBlueWizard> gotta go...bye
<delta> ++
<Safrole> Does this definition sound kind of bogus... "If H is a subgroup of G, then by the centralizer C(H) of H we mean the set { x is an element of G such that xh = hx for all h (element of H) }
<Safrole> shouldn't it be x is an element of H such that....
<cjohnson> http://mathworld.wolfram.com/Centralizer.html
<cjohnson> Mathworld says it's x \element G
<Safrole> yeah cjohnson but we're talking about C(H)
<Safrole> not C(G)
<Safrole> that implies that every element that is in G is in H
<cjohnson> Likewise, the centralizer of a subgroup H of a group G is the set of elements of G which commute with every element of H, -- C(H) = { x \element G | \forall h \element H, xh = hx}
<Safrole> well I guess to commute
<Safrole> that implies that that element in G is in H
<coshx> i'm reading the problem of the day for Oct. 20th as "d divides n approaches F_d divides F_n". Can someone help me with the notation?
<exsisonek> the centralizer generalizes the center
<exsisonek> in that C(G) = Z(G)
<exsisonek> so the def. is correct
<Safrole> No...
<Safrole> C(G) != Z(G)
<exsisonek> counterexample?
<BotBuilder> what should you call the parts of a number like 12.3, 12 is the ? and .3 is the ? I was thinking whole number/ fraction or decimal.
<xhaju> hi
<exsisonek> x in C(G)-> x commutes w. every y in G -> x in Z(G) -> C(G) subset of Z(G), and the reverse holds
<exsisonek> but C(H) usually != Z(G) for proper subgroups H of G
<Orbital_> someone know if isetl exist for Unix/Linux ?
<coshx> BotBuilder: I like saying the integer part and the fraction part
<Orbital_> sorry for my english ;)
<BotBuilder> coshx - ok that sounds good
<BotBuilder> integer component and fraction component perhaps?
<coshx> sure
<Pije> i've made a semilog graph. it has six data values that relate two variables. i want to use the graph as a standard curve to predict one variable given the other variable.
<exsisonek> safrole: I've looked this up in Scott's Gp. Thy and the definition is correct
<Pije> is it appropriate to calculate the equation (y=mx+b) for each line segment between my known data points, and then use that equation to estimate all of the given variables that fall within the range covered by that line segment?
<Pije> or is that inappropriate?
<Pije> i don't fully understand semilog graphs.
<Pije> bleh. i mean, to estimate the corresponding variable for all given variables that fall within each of my known data points
<Pije> tell me if my question is unclear
<Extim> find all solutions in [0,2pi) for the trigonometric equation below cos2x = -1? anyone?
<coshx> Extim: what are all the solutions in [0, 4pi) for the equation cos x = -1 ?
<Extim> uh
<Orbital_> bonne nuit
<Extim> =/
<coshx> Extim: you could try graphing it to get an idea of what the function looks like.
<Kampen> wouldn't it be from 0 to pi extim? not 0 to 4 pi.
<Kampen> since the 2 halves the period
<Kampen> oops i mean coshx
<Extim> yeah, the graph doesnt really help me
<Kampen> extim: where does cos(x) = -1? then just let that angle = 2x and so x = angle/2
<coshx> Kampen: i was thinking of doing something like y = 2x.
<Extim> so would the solutions be pi/2, and 3pi/2?
<Kampen> is cos(x) = -1 at 2pi?
<Kampen> so no to the 3pi/2
<Kampen> the pi/2 yes though.
<Treatz> Do you ever click on googles text based adds?
<Kampen> actually, nevermind, yeah
<Extim> they are both correct?
<Kampen> yep
<Kampen> they're both in [0,2pi] and they both give -1 when plugged into cos(2x), don't they?
<Extim> yea, im just getting confused, i havnt done trig in awhile =/
<Extim> thx for ur help Kampen
<Kampen> actually, coshx helped you more than i did :)
<Kampen> i'm having multiple brainfarts courtesy of the dextromethorphan in dayquil.
<_tcc> anyone know biology here?
<Anil> _tcc- wrong place pal :P
<_tcc> Lol I need a bio channel :(
<de1337> anything advanced?
<_tcc> huh?
<de1337> i suppose you had a question
<_tcc> no just a question on resistance to disease
<_tcc> If using food irradiation would kill bacteria..., BUT would killing bacteria actually have a bad side effect of making us even more vulnerable to disease
<BotBuilder> yeah
<de1337> depends
<BotBuilder> tis why there's alot more alergies nowadays
<BotBuilder> people are going all cleanly so you dont get exposed at an early age
<_tcc> heh
<_tcc> what was that?
<what> who me?
<BotBuilder> (16:06:37) BotBuilder: tis why there's alot more alergies nowadays
<BotBuilder> (16:07:08) BotBuilder: people are going all cleanly so you dont get exposed at an early age
<_tcc> yeh
<BotBuilder> same thing as even having any medicine
<BotBuilder> medicine makes the species weaker
<_tcc> yep i must point this out
<de1337> BotBuilder: you are generalizing to much
<de1337> in all cases it wont
<_tcc> Is 25 out of 90,000 dieing worth irradiating food?
<_tcc> is it really needed....
<BotBuilder> is their such a thing as generalizing too much?
<_tcc> I say no
<_tcc> Life goes on
<de1337> BotBuilder: yes, when appling thats always the case when it aint
<OtherAlfie> Increased allergies can also be due to increased pollution.
<_tcc> Plus its a way to weed out the weak
<BotBuilder> I suppose medicines for things that you would nonfatally recover from would be ok
<de1337> implying*
<BotBuilder> otheralfie - thats true
<_tcc> Food Irradiation is just not necessary
<Anil> let's not make me forward this chan to #we_love_bio
<de1337> BotBuilder: no it aint
<BotBuilder> why not?
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