Sat 12 Nov, 2005 02:47 am - Hi, I'm having slight problems with the following equilibrium question and was wondering if anyone could help me out? I'm not really good at visualizing these situations so help is very... (view)
Thu 13 Oct, 2005 04:28 pm - Hmm can someone help me with the following questions?
1) How do you determine a matrix is an elementary matrix? For example if you were given:
1 0 0
0 1 9
0 0 1
Is this an elementary... (view)
Sun 9 Oct, 2005 05:06 pm - ahhh :D Thanks Thomas! If you hadn't pointed out my silly mistake I would have been at the question for ages :oops:
Can I just ask one more question?
If f(x,y,z) = xy^2 - yz^2... (view)
Sun 9 Oct, 2005 04:52 pm - oh oh!! omg i can't believe I derived ln (u) wrong :oops:
the correct answer should be:
u (x) = x/(x^2+y^2)
u (y) = y/(x^2+y^2)?
And if you multiply x to u(x) and y to u(y), you... (view)
Sun 9 Oct, 2005 04:50 pm - oh oh!! omg i can't believe I derived ln (u) wrong :oops:
the correct answer should be:
u (x) = x/(x^2+y^2)
u (y) = y/(x^2+y^2)? (view)
Sun 9 Oct, 2005 04:37 pm - oh no...they are wrong? :oops:
hmm I dunno I can't seem to spot the mistakes...did I use the wrong method of differentiation? I just applied the chain rule by letting:
1/2 ln (u)... (view)
Sun 9 Oct, 2005 04:21 pm - yer sorry I forgot to multiply my answers with the x and y :oops:
But anyway, I'm not sure how to approach the proof....can anyone offer any help? Is it just the application of log... (view)
Sun 9 Oct, 2005 03:46 pm - Help! Can someone help me out with this question?
[URL=http://tinypic.com/eg5mhi.jpg]Question here[/URL]
My answer for finding u(superscript x) and u (superscript y) are:
u (x) = x ln... (view)
Wed 5 Oct, 2005 01:58 pm - ohh that simple?
Would the same apply to da format if:
statement a = n is divisible by 6 and
statement b = n is divisible by 9?
a => b but b does not => a since n = 9 is a counter... (view)
Wed 5 Oct, 2005 12:49 pm - oh thanks guys! I get the how to prove number 1) but I'm still wary over the 2nd question. I just cant seem to get my head round it :roll:
This is the example we were given:
Decide... (view)
