Rules Definition and 539 Threads

International rules football (Irish: Peil na rialacha idirnáisiunta; also known as international rules in Australia and compromise rules or Aussie rules in Ireland) is a team sport consisting of a hybrid of football codes, which was developed to facilitate international representative matches between Australian rules football players and Gaelic football players.
The first tour, known as the Australian Football World Tour, took place in 1967, with matches played in Ireland, the United Kingdom, and the United States. The following year, games were played between Australia and a touring County Meath Gaelic football team, Meath being the reigning All-Ireland senior football champions. Following intermittent international tests between Australia and Ireland, the International Rules Series between the senior Australian international rules football team and Ireland international rules football team has been played intermittently since 1984, and has generally been a closely matched contest. The sport has raised interest and exposure in developing markets for Gaelic and Australian football and has been considered a development tool by governing bodies of both codes, particularly by the AFL Commission.
International rules football does not have any dedicated clubs or leagues. It is currently played by men's, women's, and junior teams only in tournaments or Test matches.

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  1. Saladsamurai

    Mathematica Mathematica: How to Do This? (Rules)

    Hi All! I am trying to get used to Mathematica and rules and all things syntax. What I am trying t do is this: If I define a variable as such m = Solve[x^4 - 4 == 0, x] The output is: {{x -> -Sqrt[2]}, {x -> -I Sqrt[2]}, {x -> I Sqrt[2]}, {x -> Sqrt[2]}} So I believe what this means...
  2. B

    Observations that broke the rules?

    It seems like there has been a couple of times in the history of physics when we have observed something that seemed to break the rules of accepted theory. What do think were some of the most surprising discoveries in the last 50 years or so that broke the rules of what what we thought was possible?
  3. Q

    Understanding Triple Product Rules in Vector Calculus

    triple product is given by A.(B x C) = B. (C x A) = C. (A x B) so why is ∇.(F x G) = [∇ x F].G - F.[∇ x G] ? if i let A = ∇, B = F , C = G, then ∇.(F x G) = - F .( ∇ x G) = G.(∇ x F) its as though they carried the 3rd term over to add to the 2nd term ?
  4. L

    Equivalent Capacitance or Resistance and Kirchoff's rules

    Homework Statement If each capacitor is filled with a dielectric material (with constant K, kappa), what is the new equivalent RC circuit? All resistors have equal value, and capacitors have equal value (without a dielectric), C. Homework Equations C = (Epsilon * Area) / Distance C with a...
  5. N

    Selection rules and quantum numbers

    Homework Statement From past paper: State the selection rules for (electric) quantum numbers n,l,m,s and j. Homework Equations The Attempt at a Solution My problem is that looking online, there seems to be an m(s) and m(l). Is the question assuming that I state the selectrion...
  6. A

    Gauss-Jordan Elimination Rules

    Can someone please explain the basic rules that must be adhered to when using Gauss-Jordan Elimination? I've been having some difficulty with it because apparently I keep doing things that you aren't allowed to do. So far, I know only the following: -You CAN multiply an entire row by a...
  7. J

    Why Do Exponential Rules Affect Equations Like -(y^2-1)^(1/2) = (1-y^2)^(1/2)?

    I have come across in the solution to a question. -(y^2-1)^(1/2)= (1-y^2)^(1/2). However I do not know why this has to be the case, and would appreciate anyone showing me, presumably using rules of exponentials, how this could be shown to be true. Similarly if the power is not fractional but...
  8. L

    Feynman Rules for Crossing Lines in Green's Function Diagrams?

    http://www.damtp.cam.ac.uk/user/tong/qft/qft.pdf Consider the Feynman rules for Green's Functions given at the top of p79 in these notes. Now let us consider the diagram given in the example on p78. Take for example the 2nd diagram in the sum i.e. the cross one where x1 is joined to x4...
  9. Ivan Seeking

    How Strict Are the Rules for Personal Experience Claims on Physics Forums?

    Please note the following from the posting guidelines https://www.physicsforums.com/showthread.php?t=5929 Let me make this clear. If you accuse another member of lying, you will receive an infraction. This rule applies as do all other rules regardless of any personal opinions that one...
  10. nismaratwork

    News Experiment: Favorite National Level Politician sans Rules

    To quote Gokul: "Name your favorite politicians at the national level, and tell us why you like them - this thread is relevant to members from all countries." Why am I doing this?... I'm curious as to whether the presence of restrictions beyond the PF norm is conducive to a different kind of...
  11. E

    Feynman rules of scalar QCD (colour ordered)

    Hey guys, does any of you know where I could find the Feynman rules for scalar QCD? If they where colour ordered, even better! Cheers, earth2
  12. M

    Equilibrium constant rules help.

    I was wondering where i could find a source for the rules to find Kc from a chemical formula? My professor tonight was changeing the formula like this: H2+Br2+2HBr then showed that 2H2+2Br2=4HBr...and getting different Kc values for each. I think that this is straight out wrong but she's the...
  13. P

    Find the derivative of f(x) = (x-1)^(2/3) using the definition and then rules.

    Homework Statement f(x) = (x-1) 2/3 We were asked to find the derivative using the alternate limit form when c = 1 and then I was then I was trying to find the derivative using the multiplication rule (u dv + v du). Homework Equations f'(u*v) = u dv + v du f'(xn) = nxn-1 The...
  14. A

    Did I Calculate the Current and Energy in the Capacitor Correctly?

    Homework Statement A voltage of 60cos(4 \pi t) V appears across the terminals of a 3mF (milli-farad) capacitor. (which is equal to .003 F [farad]). Calculate the current through the capacitor and the energy stored in it from t=0 to t=.125 s Homework Equations Current through an ideal...
  15. O

    Is there a limit to how many derivative rules you can do within another rule?

    Like for this question. y = sqrt ( 5x - sqrt ( x^2 + 3 ) ) - this question is a square root within another square root. So I rearranged it like this: y = ( 5x - ( x^2 + 3 )^1/2 ) ^1/2 dy/dx = 1/2 ( 5x - ( x^2 + 3 )^1/2 ) ^ -1/2 x ( 5x - 1/2 ( x^2 + 3 )^ -1/2 ) I got up to there, but...
  16. B

    New Feynman Rules in QED from Counterterms

    Hi, I have been looking at the renormalisation of QED and been using Peskin & Schroeder. I understand (I think) what is going on, but I am slightly confused over 2 issues: 1. In the new feynman rules from the counterterms, the feynman diagrams all have a small circle with a cross in...
  17. P

    RC Circuit/Kirchhoff rules question?

    RC Circuit/Kirchhoff rules question?? Regarding the loop rules. I am trying to solve a problem with 2 batteries, 3 resistors and one capacitor. I know the rules regarding the loop and traversing resistors and batteries. My question is, what happens when the direction of current I choose...
  18. A

    Fajan's Rules and Electronegativity

    Hey friends, I am having some confusion regarding covalent character of ionic bonds (Fajan's rules) and polar character of covalent bond (electronegativity and dipole moments). We apply Fajan's rules when we start a bond to be purely ionic, as in NaCl, and derive it's partial covalent character...
  19. Z

    Selection rules beyond the central field approximation

    Hi I'm trying to figure out how to get the electric dipole selection rules for an atom with many electrons. In all textbooks that I've seen it's shown for Hydrogen, or in the central field approximation (which is, in some sense, equivalent to Hydrogen). Obviously the central field...
  20. V

    Is this breaking any math rules

    Homework Statement I think I have a neat way of solving this bugger, but I'm not sure if it is a mathematically "legal" route. I don't know if there is a smarter way to solve this or not.. ∫ √(x^2 +1) dx from 0 to 1 The Attempt at a Solution I = ∫ √(x^2 +1) dx x= tanϑ √(x^2...
  21. N

    Understanding Cutkosky's Rules for Bhabha Scattering and the Optical Theorem

    Please teach me this: When we use cutting rule for Bhabha scattering to cut the Feymann diagram to parts.Why we know the two parts are complex conjugation of each other,so we have optical theorem: 2ImM(s)=... M.M*... Thank you very much in advanced
  22. L

    Feynman rules for Majorana fields (based on Srednicki)

    Hi, So if we have an interaction Lagrangian for a Majorana field: L_1=\tfrac{1}{2} g\phi\Psi^{T}C\Psi Now looking at the path integral, I believe this must go like: Z (\eta^{T},J) ~ \exp{[\tfrac{1}{2} ig \int\,\mathrm{d}^4x (\tfrac{1}{i}\tfrac{\delta}{\delta J(x)...
  23. T

    Integration rules: something so simple

    I know the antiderivative of 1/(x^(1/2)) dx is 2(x^(1/2)) + constant, and i can prove it if i rewrite the inverse equation to be x^(-1/2). However, leaving it in the fraction form of "one divided by x to the one-half power", i always come up with 2/(3x^(3/2)). Am i doing something wrong...
  24. L

    Supercharges commutation rules

    Hi all I'm new on this forum. I'm here since I'm working with n-extended susy and R-sym and I don't know how to calculate a commutator. First of all I introsuce my notation: \mu_A T^A is a potential cupled to R-sym generator \mu_{\alpha i} is a superpotential cupled to supercharges...
  25. Math Is Hard

    New Rules for the PF Philosophy forum beginning January 1, 2011

    The announcement and discussion thread is here. Please also read page 2 of the applicable rules. https://www.physicsforums.com/showthread.php?t=459349
  26. C

    Exploring Pair Production: Rules and Resources

    Hey all, Just like to prefix this question with the statement that I am a computer scientist with a strong interest and passion for physics, so please forgive me if this question is a tad naive. With that out of the way, I have a general question about this image: It's from "The Little...
  27. lpetrich

    Calculating Lie-Algebra Branching Rules

    I have a problem with doing that. I've discovered some formulas for doing that, which I've found by making certain plausible assumptions and requiring self-consistency in various special cases, like adjoint -> (adjoint,scalar) + (scalar, adjoint) + (extra stuff) but I haven't found...
  28. J

    Feynman rules and decay process

    Hi I need help to understand Feynman rules for decay for exams. In past paper there is the following question as whether the following are allowed. cc decays to tau++tau-. From What I can see this is possible via the strong force is this correct? The next is cc decays to cu and cu. From...
  29. turbo

    I LOVE this woman Mariska rules.

    I LOVE this woman! Mariska rules. When she started portraying a detective on Law and Order, SVU, who was assigned to sexual abuse cases, she got mail from victims of sexual assault/abuse. She and her husband started a foundation to help the victims of such abuse, in real-life. I LOVE this...
  30. Y

    Rules for gaussian random variables - ornstein uhlenbeck process

    Homework Statement The Langevin equation for the Ornstein-Uhlenbeck process is \dot{x} = -\kappa x(t) + \eta (t) where the noise \eta has azero mean and variance <\eta (t)\eta (t')> = 2D(t-t')\delta with D \equiv kT/M\gamma. Assume the process was started at t0 = - \infty. Using...
  31. A

    Kirchhoff's Rules and potential difference

    Homework Statement Find the potential difference between points a and b. each resistor has R=130 ohms and each battery is 1.5V Homework Equations Kirchoff's First Rule: at any junction point, the sum of all currents entering the junction must equal to the sum of all currents...
  32. Hepth

    Can You Taylor Expand a Dual Integral with Variable Limits?

    Assume I have a function: f[x,y] This function has two real values (a,b) that are very small O(0). My end result should be: F[a,b] = \int_{y_a}^{y_b} \int_{x_a}^{x_b} dx dy f[x,y] Whereupon I would then expand F about a=0 and b=0. Now my problem is that the integration is very...
  33. M

    Rules for curl test applicability

    trying to remember rules for curl test applicability. is it just simple closed curve? is F=-ysin(x)i+cos(x)j able to use the curl test?
  34. B

    Questioning Quantum Rules: Is A(A or B) = A(A) + A(B)?

    Homework Statement See q attached Homework Equations The Attempt at a Solution So basically... my questions is this: I thought that the rule in quantum for p(A or B) is that A(A or B) = A(A) + A(B) then you square [A(A) + A(B)] to find p(A or B) (where A(X) is amplitude of X)...
  35. Z

    Rules behind this type of division?

    I know this is a silly question for a 12th grader to ask but I don't know the exact rules. If we divide 950 by 121, the first digit of quotient is 7, then we place a decimal after 7 and bring one 0 down, which is correct way. In the division of 21780/704, the first digit of quotient is 3...
  36. Evo

    4-Year-Old Can Be Sued, Judge Rules in Bike Case

    So, what kind of judgement could they get against a 4 year old? Can they get a judgement against future income? Put the careless kid in reform school? The article makes it sound like the judge feels the child intentionally or carelessly rammed her bike into the old woman, which may have...
  37. Z

    HNO3 & CH3COONa: A Buffer Solution That Doesn't Follow the Rules

    I read somewhere that HNO3 and CH3COONa can act as a buffer solution. I know that the following solutions can act as a buffer- 1) A solution of weak acid and its salt with a strong base. 2) A solution of strong base and its salt with a strong acid. 3) A solution of a salt of weak acid and a...
  38. B

    Allowed Transition from 2s^2 to 2p^2 in Hydrogen: Why is it Missing?

    Why is there no allowed transition from the 2s^2 S_{\frac{1}{2}} state to the 2p^2 P_{\frac{3}{2}} state in the attached image? It seems to fulfill the selection rules \Delta l = \pm 1 and \Delta j = 0, \pm 1. This is for electric dipole transitions by the way.
  39. 0

    Simultaneous Equations From Kirchhoff's Rules

    Homework Statement For a Lab report I have to solve for three unknown currents from Kirchoff's Rules equations using simultaneous equation algebra, and I'm completely stumped.Homework Equations From Loop and junction equations, the three equations that I have are I1 + I2 = I3 I1= (-I3R3 -...
  40. N

    Is LanHEP the Answer for Generating Feynman Rules from Lagrangians?

    Gents, Is there such software package or something like that... when you input the lagrangian it gives you the vertecies (Feynman rules)... Thanks
  41. X

    Proving Acceptable Wave Functions in Quantum Mechanics

    Homework Statement [PLAIN]http://img716.imageshack.us/img716/8330/werhc.png Homework Equations The Attempt at a Solution My question is what do I need to prove to show that the wave function is acceptable. So far all I can think of is showing that the wave function is 0 outside...
  42. M

    Find Current with Kirchhoff's Rules

    Homework Statement I just need to check if my answers are correct [PLAIN]http://img99.imageshack.us/img99/5139/physicsproblem.jpg a) Find # of junction points b) Find # of arms c) Find currents in all arms by applying Kirchhoff's Rules Homework Equations Current in = Current out Potential...
  43. T

    Math Laws, Rules, and Precautions?

    Hey! I am curious to know if there is any book, site, or reference material that teaches you strictly on math laws. For example, they may give you formulas (like synthetic division).. and tell you that every time you use the restriction ( that happens to be a fraction, you must divide it...
  44. wolfspirit

    Rules in surds is that any number of the power of 0

    One of the rules in surds is that any number of the power of 0 must equal 1 And as Infinity is nothing more than a never-ending number then does it stand to reason that Infinity to the power of 0 must equal 1 but my question is what is 1 Is 1 (in this situation) an abstract concept or does 1...
  45. M

    Proof: Positive Real Numbers as Vector Space with Modified Operations

    Homework Statement Show that the set of all positive real numbers, with x+y and cx redefined to equal the usual xy and xc, is a vector space. What is the zero vector? The Attempt at a Solution My attempt stops at me trying to decipher the problem. Are they asking me to take particular...
  46. H

    Solving Kirchoff's Rules in a DC Circuit

    Homework Statement The circuit in the figure is composed of two batteries (e1 = 8 V and e2 = 6 V) and four resistors (R1 = 110 W, R2 = 40 W, R3 = 30 W, and R4 = 50 W) as shown...
  47. L

    Dot Product Rules Multiple choice

    Homework Statement See the image http://tinypic.com/r/33z6vz5/7 Homework Equations The rules of dot product multiplication. The Attempt at a Solution I've determined that 2 of the solutions are valid, while two of the choices are invalid. I thought C and D looked correct, making A...
  48. C

    Question on rules of inference

    Homework Statement What rule of inference is used with the following statement: Kangaroos live in Australia and are marsupials. Therefore, kangaroos are marsupials. I set this up as p = kangaroos live in Australia and q = kangaroos are marsupials. Therefore, p. To me, it looks like the...
  49. C

    Are Logical Rules Universally Applicable?

    Hi again, everybody. I have been mulling over lately some important assumptions we made when thinking, but suddenly I realize I cannot justify them all. Here is one of them: Supposing there exists parallel universes, would their physics laws obey our logical rules? Or rephrasing it: Could...
  50. E

    Divisibility rules using sum of digits

    I saw someone discussing divisibility rules in another thread and would thought I would make a note that the divisibility rule of 9 of summing the digits to see if you end up with 9 is really a trick of the counting base you are using (base 10). In general, this divisibility rule applies to...
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