Recent content by dglee

thanks a lot vietdao so when h-->0 it tends to go near 1 and both ways approaching from neg or pos will approach near 1 so it equals 1. yah giving me a lot of mathematical analysis limit definitions. thanks i understand it thanks!

well opz i mean |sin(x)| is not differentiable at pi 2pi and 2npi. ok i understand now that |x| is continuous everywhere but can not be diff at 0 because we can not estimate a slope at x=0. (|1+h|-1)/h thus always = to 1 for all h but however you can not plug 0 in or you will get an...

can somebody show me how to solve this? lim h-->0 (|1+h|-1)/h = 1?

this is embearassing... i understand that |h|/h = h/h or -h/h at x=0 so that would be undefined. but can we say at a certain point |x| is discontinous at x=0 when we take the derivative at x=0 because we can not evaluate the slope at x=0? is that correct to say? and that the derivative of...

Can somebody help me review derivatives of abs values? for example derivative of |sinx| and sin|x| and |x| and what is the formal definition of discontinuity is it that since |x| is discontinous at 0 is because you can not find the slope of |x| at 0?

the thing to this question is e^x cos(x) you integrate it a few times and when you integrate it you will go back to this function e^x cos(x) then (integral e^x cos(x) = blah blah blah blah blah +-(either plus or minus: say minus) integral e^x cos(x) dx) so now you add the integral(...

does anybody know the identity for |sinx-siny| and |cosx-cosy|?

testing testing

I tried that but then i can't show that L(x,y)=w=5/2 which makes the game unfair. If i use Rowboy's strategie as [1/2,1/2,0,0] i get the game is at w=3/2 which doesn't equal to 5/2. I know that is a feasiable strategy but its not optimal.

In the game with payoff Matrix [4,2,0,-1,5,-2] [-2,-3,2,5,0,4] [5,-3,4,0,4,7] [1,3,3,2,-6,5] Columngirl's strategy of [1/2,0,0,1/2,0,0] is optimal. Describe all the optimal strategies for Rowboy. Find the value of the game and show that this game is not fair. Thing is i can't...

i hope somebody can answer this... lol I am really interested in what it means.

hmm well i copied that question straight from the movie... that movie with Russel Crowe as John Nash. Where he teaches multivariable calculus and he put that question down on the board.

I was bored so I am deciding that since I am only at the level of undergraduate real analysis, i wonder if anybody could solve this problem. In the movie it said that it would take someone months or many yrs or even a life time. Wonder if this is true or not? V = \{ F : \Re^3 \setminus X...

Have you ever thought of becoming an Quant? www.global-derivatives.com

Wow thanks a lot for your help. I will try to figure this out. You helped a lot pizzasky and Tide. :smile: