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alamps3

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  1. Did you find the REA book helpful. I heard they were aweful so I didnt buy it.
  2. oh ok. i think i get it now. thanks a lot
  3. thanks for helping me. i think there is something that i still dont get though. what you are saying basically explains that... (1/2)*integral(-y dx + x dy) =(1/2)*integral(-y dx) + (1/2)*integral(x dy) but i still don't see how it follows that ... =(1/2)*integral(-y dx) + (1/2)*integral(x dy) =integral(-y dx) =integral(x dy) why must each of the summands be equal? maybe there is something abt line integrals that i don't understand i guess. if you can point it out then that might help me out i guess. ok. thanks again.
  4. ok, so I dont know how to draw integration signs on this thing if it is possible, but let me try to ask the question anyway. So Green's Theorem is : line integral on closed curve C (M dx + N dy) = double integral on region R [(dN/dx - dM/dy) dA] So, based on this, we can show that: double integral on region R (dA) = 1/2 * line integral on closed curve C (-y dx + x dy) Ok. I get that part, but then they say that it follows obviously that: double integral on region R (dA) = line integral on closed curve C (-y dx) = line integral on closed curve C (x dy) I dont see why this has to be true. Can someone explain it to me please. Thanks. If anyone has the book, what I'm talking abt is in the Princeton Review Book on page 153 in the 3rd Ed and I'm not sure if its on a diff page or what in any other edition.
  5. hey zwg. im taking the nov test i think. i havent logged in here for a while but I do every once in a while. i hope this forum picks up too. i put up a question here and there and i usually get a response within a couple days so i find it useful. lemme know if u found any other, perhaps more lively, forum which would b beneficial for us. ok then ttyl.
  6. 64) Suppose that f is a continuous real-valued function defined on the closed interval [0,1]. Which of the following must be true? I. There is a constant C>0 st |f(x) - f(y)| II. There is a constant D>0 st |f(x) - f(y)| III. There is a constant E>0 st |f(x) - f(y)| answer is I and II only. Can someone provide a counterexample to 3 to show why it doesn't have to be true.
  7. Can someone expand on why this is true. I don't understand.
  8. hey mathematics_1. thats a great score. just wondering, where do u go to school and have u been admitted to any great schools yet for grad studies. i dont mean to be nosey...i was just wondering what kind of scores u need to get into a top program b/c im taking the test in april. if anyone else can ans this for me that would be great too. thanks
  9. it seems noone has been using this forum since last december. is there a reason for this, ie is there another forum site ppl are using or is there a reason i dont know about that ppl are not taking the test next month?
  10. oh yeah. i knew it had to be something simple seeing that a high percentage answered it correctly. thanks
  11. I'm sure most people have downloaded the practice book so please refer to it for my question. in #34, the one about limits of f and f', the answer is a, but why is b also not a correct answer? In fact, if a is the answer, doesn't b also HAVE to be true as well? can some show me a function that proves that b must not also be true? Thanks.
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