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  1. Affinity

    Geometry proof

    which book is it
  2. Affinity

    Geometry proof

    You must have left something out... for example something along the lines of NML JKL add up to 90
  3. Affinity

    First Order Peano Arithmetic (FOPA) Question

    Which university/course is this for? you should really look for more suitable forums than this one I assume your "A is true" means that the sentence A is true in the standard model that is N |= A where N denotes the standard model you can't have PA |-- A PA |-/- A in fact precisely one of...
  4. Affinity

    Is it really hard to learn Chinese ?

    It's difficult if you try to compare everything with english and try to translate everything
  5. Affinity

    economics @ USYD or UNSW??

    This guy knows what he is on about.
  6. Affinity

    HSC Mathematics Tutoring

    If sicmacao is who I think he is.. then he definitely knows his stuff. EDIT: confirmed..
  7. Affinity

    Pure vs. Applied Mathematics.

    You know you are doing pure maths when you don't see numbers more than 10.
  8. Affinity

    Integration and reverse chain rule

    as long as you know what you are on about they will give you the marks... math teachers at state schools were quite good, atleast when I did the HSC
  9. Affinity

    Pure vs. Applied Mathematics.

    Thats call drudgery.. not mathematics
  10. Affinity

    question on min(x_1,x_2)

    that results in a simpler expression than using P(* <=n) since P(A and B) = P(A)P(B) but you can;t say the same with P(A or B) (when A, B are independent) with the other one you will have to interpret the meaning of "a geometric rv"
  11. Affinity

    Should I continue???

    Don't drop if you have 12 or less units.. makes you lazy
  12. Affinity

    need some help with mechanics

    The usual algorithm is: identify forces acting on the particle, this should be a complete list (I hope): 1. Gravity 2. Normal reaction force 3. Tension 4. Friction/resistance then fill in those you know and put an arrow and a letter in for those you don't. gravity is straight forward...
  13. Affinity

    Should English Be Compulsary Poll

    This my dear is just as indecipherable as a postmodernist text. the terms conceptual learning, integrity and analytical could mean almost anything. In most cases these terms are just flashed around without the user needing to know what they are on about. If I interpreted your post...
  14. Affinity

    maths at uni

    Stochastic analysis owns
  15. Affinity

    question on min(x_1,x_2)

    You can go along the lines of: P(min(x1,x2)>n) = P(x1>n and x2 > n) = P(x1 > n)P(x2>n) = [(1-p)^2]^n or you can argue that a geometric random variable is the number of indepedent trials needed to record a success.. now with min(x1,x2) is the smaller of these so you can look at it as 1...
  16. Affinity

    Should I continue???

    just stick with it..
  17. Affinity

    question on min(x_1,x_2)

    you can't sum like that. If you condition, then you would need to write for, x1 <= x2 Sigma(x1=1 to infinity) Sigma(x2=x_1 to infinity) z^x1 p(1 - p)^(x1-1) . p(1 - p)^(x2-1) = ... for, x2 < x1 Sigma(x1=1 to infinity) Sigma(x2=1 to x_1-1) z^x2 p(1 - p)^(x1-1) . p(1 - p)^(x2-1) = ...
  18. Affinity

    question on min(x_1,x_2)

    I think this is wrong, zp/(1-z+zp) = \sum_{n=1}^\infty z^n f(n) though
  19. Affinity

    question on min(x_1,x_2)

    Oh this makes it different.. and easier. I knew it was something related.. If you consider 2 random variables X1 and X2 with geometric distribution given by the fs.. (that is with parameter p) then Y=min(X1,X2) is another geometric random variable with parameter q=[1-(1-p)^2]. (think why!) so...
  20. Affinity

    Traditional of Simplified characters, and why?

    Traditional
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