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. N

    What is the role of the i in the propagator of Feynman rules?

    I'm probably missing something small but I haven't been able to figure this out. In the Feynman rules (for a scalar field that obeys the Klein-Gordon equation), you write a propagator for internal lines as \frac{i}{k^2 - m^2 + i \epsilon}. The propagator integrand is originally...
  2. T

    How Can I Effectively Contribute to Discussions on this Forum?

    I am new here to say all of you "hi!". Hope to be welcomed by all of you. I would like to be the part of the discussion going in this forum. And I think that you are enjoying a lot on this site. I am here for too which will enjoy soon. I am new here and I hope you will guide me to follow the...
  3. D

    Integral (1/x^n): Convergence/Divergence Rules

    Homework Statement give a general rule for when Integral (1/x^n) from (x, 0, a), a>0 converges or diverges. Homework Equations The Attempt at a Solution I have checked the textbooks for this answer but i can't seem to find it. The closest i got was Integral (1/x^n) from (x, 1...
  4. S

    Feynman rules - where's the physics?

    I have been studying how to apply the Feynman rules for QED to various simple first order process (as prescribed by Griffiths' 'Introduction to Elementary Particles'). So far, all is well. I can follow the rules, and develop the results, and it all looks very clever. My problem is that so...
  5. D

    Selection Rules for EM Dipole Radiation

    hey, I was asking myself a few questions about the selection rules for EM dipole radiation which occurs if electrons "jump" into lower bound states according to the selection rules. now I know that the full explanation about matrix elements of the dipole operator comes from fermi's golden...
  6. M

    Rules of limits (breaking a larger limit into 2 smaller ones)

    Hi What rule or theorem of limits says that you can do this with a limit lim(h->0) (a+b)/h = lim(h->0) a/h + lim(h->0) b/h The book i am reading has just done something like that to a limit without saying why you can do that thanks
  7. B

    Clarifying the rules of Reflection

    I have searched topics like reflection forum and I always seem to get different answers. I'm hoping to reconcile all of this, I've read FAQs, threads, wikipedia... To explain reflection I've heard these 3 explanations: 1) Light is absorbed by an atom, then re-emitted at a later time randomly...
  8. O

    What Happens to the Limit of ln(x) + 1/x as x Approaches Zero from the Right?

    Homework Statement Find limit lim x->0+ of lnx+1/x Homework Equations 1/x = ln e^1/x The Attempt at a Solution ln x + ln e^1/x = ln x*e^(1/x) lim x-> 0+ ln x + ln e^1/x = ln 0*inf = ln 0 = - inf lim x-> 0+ Source: my self vs http://www.numberempire.com/limitcalculator.php
  9. K

    Ray Tracing Rules: Concave & Convex Lenses & Mirrors

    Can anyone brief of on the different rules for doing ray tracing for both concave and convex lenses, as well as both concave and convex mirrors?? I understand the concepts but i can't seem to keep ray tracing in my head from the way our textbook explains it...
  10. Hepth

    Feynman Rules : Propagator Question

    I know I should know this, but I have a quick question. Let's say we have a diagram: 1-->----------2 | | <- "q" v | 3--<----------4 Lets assume: 1 = "quark" 3 = "antiquark" 2 = W boson 4 = photon q = same quark flavor as "3" Time...
  11. S

    Why Do These Quantum Mechanical Selection Rules Result in Zero?

    I am having trouble showing: <4 3 0 | p_z^2 | 4 0 0 > = 0 and <4 2 1 | x p_y | 3 1 0 > = 0 I know the usual selection rules for parity, spherical tensors (Wigner-Eckart for x,y,z) but I can't convert these two to anything I know. You could also help by telling me how to convert these to...
  12. R

    Differential operators - the rules

    I always get slightly confused with the rules of differentials. now \frac{d^{2}y}{dx^{2}} is the scond derivative of the function y(x but rooting this does NOT give the first derivative dy/dx However, with the operator \frac{d^{2}}{dx^{2}}, it seems that you can root this and it DOES...
  13. K

    What is the correct way to apply Kirchhoff's rules to this circuit?

    http://img17.imageshack.us/img17/201/73448266.jpg let's suppose that we know all resistors and voltages by applying kirchhof rules we have V1 - i*R1 - i*R2 -i2*R3 = 0 V1 - i*R1 - i*R2 - i1*R4 - V2 = 0 -V2 + i2*R3 - i1*R4 = 0 we know V1,V2,V3 R1,R2,R3 and we can find the currents...
  14. M

    Kirchoff's Rules, Mathmatical/Logic help?

    Hello all. I feel like such a retard, but there's an example problem in my book with the answer, and I just don't know how they are getting the answer. I suppose it's due to my lack of mathematical skills. I was wondering if someone could guide me on how they got the answer...
  15. Z

    Finding current in circuit using Kirchoff's Rules

    Homework Statement http://img25.imageshack.us/i/circuitj.jpg (Image won't show up, here's the link http://img25.imageshack.us/i/circuitj.jpg/) Homework Equations Kirchoff's Junction & Potential rules. The Attempt at a Solution http://img29.imageshack.us/i/circuit2.jpg (Image won't show up...
  16. L

    Kirchhoff's Rules Homework: Current & Voltage Measurements

    Homework Statement So i had to do an experiment which consisted of measuring the current and voltage across different resistors. Here's my question: i recorded the current through the wire that passes through the resistor and compared it with the current which i calculated (theoretical). In...
  17. V

    Kirchhoff's Rules: Find I_1, I_2, and I_3 in Circuit w/ Short Circuits

    Homework Statement Using a circuit similar to the circuit of the figure, but with the 55.0-V and 57.0-V sources replaced by a short circuit, determine the currents in each resistance. here is the diagram: http://session.masteringphysics.com/problemAsset/1054847/7/YF-26-89.jpg Find...
  18. X

    Group representations/branching rules question

    Hi, there exist tables with group theory breaking patters and branching rules such as E_7 \rightarrow E_6 \times U(1) 133 \rightarrow 78 + 1 + 27 + \bar{27} 56 \rightarrow 1 + 1 + 27 + \bar{27} What is missing is the U(1) charge. Does anyone know how to obtain it? Perhaps it could be...
  19. N

    Feynman rules (vertecies) for graviton

    Hi, Could u advise me please some references where the Feynman rules for graviton are derived I mean graviton-scalar graviton-graviton scattering ... in general graviton vertecies ... Thank you
  20. fluidistic

    Range of validity of Kirchhoff's rules

    I'd like to know if Kirchhoff's laws of voltage and current are valid in circuit with alternate current. If I'm not wrong, in such circuits, the E field provided by the emf is varying with time. And I've heard that Kirchhoff's laws are a special case of Faraday's law of induction but with a...
  21. E

    Does Verlinde argument imply 3 spatial dimensions and rules out String theory?

    String theory requires 9 spatial dimensions, M-theory 10. One followup to Verlinde's paper is this: http://arxiv.org/abs/1002.0488 Hidden symmetries for thermodynamics and emergence of relativity Liu Zhao (Submitted on 2 Feb 2010) Verlinde recently proposed an idea about the thermodynamic...
  22. A

    Kirchhoff's Rules: Find Currents in 2R, 3R, 1R, 4R, 10R Circuit

    Find currents , , and given the following values of resistances in the circuit: = 2.00 , = 3.00 , = 1.00 , = 4.00 , and = 10.0 . Enter your answers in amperes, separated by commas.
  23. Z

    Solving for Delta Squared: Rules & Examples

    How does one deal with a delta squared ? For example, volume is a function of del Diameter and del Length. If i let v = d^2(pi)L/4, and then call the d and L del. d and del L, when i separate for d i get del d^2 So I'm wondering if there are any special rules for squaring a "del"
  24. R

    Using Hund's rules to calculate ground state of erbium

    Homework Statement Calculate ground state of erbium [Xe] 4f^12 6s^2 The Attempt at a Solution so i know that the f orbital can hold 14 electrons and has 7 types of orbitals that is -3,-2,-1,0,1,2,3 So i constructed a table with axes of m_l (-3 to +3 above) and m_s. Then hunds rules...
  25. N

    Analysis Applying Combination Rules

    True or False, with a proof or counterexample. a) If bn ≠ 0 and an/bn →1, then an-bn → 0 b) If bn ≠ 0, bn is bounded and an/bn → 1 then an-bn → 0 At the moment I cannot even see which is false so I am struggling with this question. I think the proof will require use of the quotient...
  26. R

    Who makes these 'physics' rules anyway?

    http://img51.imageshack.us/img51/659/car.gif Not intended as a political statement.
  27. S

    Definite Integrals - Average Values, Integration Rules?

    Homework Statement Find the average value of the function f(t) = (t-3)^2 on [0,6] Homework Equations Average value equation (see below) The Attempt at a Solution Okay, I have this: http://img4.imageshack.us/img4/5338/howthecrap.png But I don't know how it gets to the last...
  28. RyanSchw

    Kirchhoff's Rules Homework Solutions for Circuit Problem

    Homework Statement Sorry for edit, accidentally posted. Circuit is show in my attachment. I have 3 loops with three unknown currents. 8 Ohms of resistance down the left side. 6 Ohms of resistance and a 4V battery down the center. 4 Ohms of resistance and a 12V battery down the right side. I...
  29. C

    Why is the transition from 3P1 to 3S1 in Helium forbidden?

    The transition in the n=2 state of Helium from 3P1 (m=0) to 3S1 (m=0) is forbidden. I know this, because I went to a lecture where a group measured the fine structure constant very precisely using this fact. However, as far as I can see, according to atomic selection rules (available here...
  30. G

    Is It Fair for Some Students to Get Extra Time on Exams?

    Today I wrote a chemistry mid term examination. I was nearly finished when I heard "OK, times up, bring your test to the front", too bad i didn't finish I thought. On my way to the front I noticed people still writing the exam. I thought well that's unfair, but hey that's life. After I handed my...
  31. S

    Is My Statics Problem Solvable?

    Hello I sometimes have difficulty determining weather a problem is solvable or have trouble gauging the difficulty of a certain approach. I think this is because of a weak background in maths Say you had a general 2d single rigid body problem Which has 2 given forces and 3 unknowns...
  32. K

    Understanding Zeeman Effect Selection Rules | Exploring Spin Physics

    I am reading some online article on Zeeman effect http://math.ucr.edu/home/baez/spin/node10.html In the article, the author mentions 4 selection rules, I wonder the corresponding transition is allowed by satisfying one of these selection rules or the corresponding line will be allowed only...
  33. O

    How Do You Derive Feynman Rules for Scalar QED Using Functional Methods?

    Homework Statement Hello all, thanks for reading... I was assigned to calculate feynman rules for the scalar QED theory via functional methods. The fields are a scalar complex field \phi, \phi^* and gauge field A_\mu, and the lagrangean is \mathfrak{L} = (D_\mu \phi)^* (D^\mu \phi) - m^2...
  34. L

    Solving Circuit Problems with Permanent Rules: Charges, Currents & More

    I have these two circuits with permanent rule: a) b) I'm asked to find: For a): the charges of each capacitor (C = 1 \muF)and the currents in each resistance. For b): the currents in each branch with the L switch on and off, the difference of potential between A and C, A and B and C...
  35. B

    Cosine and Sine rules to get magnitude and direction of a resultant force

    Use the cosine and sine rules to determine the magnitude and direction of the resultant of a force of 11 kN acting at an angle of 50 degrees to the horizontal and a force of 6 kN acting at an angle of -30 degrees to the horizontal. helppp please
  36. S

    Differentiation Rules - Products~

    1. Suppose the curve f(x)=(x^4)+a(x^3)+b(x^2)+cx+d has tangent line when x=0 with equation y=2x+1, and a tangent line when x=1 with equation y=2-3x. Find a,b,c,d 2. d/dx f(x)g(x)=g*f`+f*g` 3. f`(x)=4x^3+3ax^2+2bx+c x=0 y=2x+1 y=1 (0,1) is a point on f(x) x=1 y=2x-3 y=-1 (1,-1) is a point on...
  37. T

    How to Use Kirchoff's Rules to Solve Complex Circuits: Step-by-Step Guide

    Homework Statement I am trying to calculate the currents on this 2 power source circuit using Kirchoff's Rules. http://img101.imageshack.us/img101/4151/kirchoffc1.jpg Ignore the numbers on the lines connecting the components and their length Homework Equations I#1=I#2+I#3...
  38. C

    Why do some women feel the need to play games in dating?

    This is a situation that happened back in 2005. I never talked to her ever since, nor am I in love with her. I am just mad at the principle that she felt a need to abide within a framework of a certain "game" and "rules". Here is the thread that describes the situation in more detail...
  39. T

    Wilson-Sommerfeld quantization rules

    Homework Statement Use the Wilson-Sommerfeld quantization rules to obtain the energy levels of a perfectly elastic particle of mass m in a cubic box of edge a in terms of the quantum numbers n_x, n_y, n_z Homework Equations \oint pdq = nh Where p is a momentum, and dq is the corresponding...
  40. E

    How Can I Find the Derivatives of this Complex Function Using Derivation Rules?

    Homework Statement I am supposed to find the first and second order derivative of p=\left(\frac{q^{2}+3}{12q}\right)\left(\frac{q^{4}-1}{q^{3}}\right) Homework Equations Derivation Sum and Difference as well as Product and Quotient Rules The Attempt at a Solution I tried to cross...
  41. O

    What is the validity of the vector identity Ax(BxC)?

    Homework Statement Regarding the identity Ax(BxC) Homework Equations Does this identity only hold when A != B != C?
  42. S

    About Feynman rules for an external field

    Hi everybody, I'm new. I'm approaching to QFT in these months and I have a couple of questions about Feynman rules. The most of the books I have read (or tried to) explain feynman rules telling what you have to do when you have an internal or external line in a graph, and when you have a...
  43. F

    Solving for Velocity in a Momentum and Kinetic Energy Problem

    Breaking rules of Algebra? Homework Statement I am copying this problem from my textbook. It is about momentum and Kinetic energy The Attempt at a Solution My problem lies in part B. According to Part A, v₁'=v₁‐kv₂' But in part B, (v₁‐kv₂')²+kv₂'²=v₁'², see the problem? v₁‐kv₂'...
  44. M

    Kirchhoff's Rules Homework: Rewrite for Disconnected Circuit

    Homework Statement The question shows a picture of a general circuit containing two power supplies and three resistors. The equation V=(3R/2)I subscript 3 explains Kirchhoffs Rules. The question asks to rewrite Kirchhoff's rules for the circuit if the power supply with voltage V subscript...
  45. B

    Logarithm Rules Proof: Calculus Approach

    proof for the differential log rule proof for the integral log rule please and thankyou
  46. L

    Is Geography a science? It is comprised of theories, Laws and rules

    Is Geography a science? It is comprised of theories, Laws (well Rules realy), hypothesis, some Math equations, aspects of Physics Chemistry and Biology. Also there is still much to be learned from it.
  47. C

    AP Chemistry Test / Solubility Rules

    I'm finding a lot of inconsistency with the solubility rules from different sources. especially when it comes to SO4(negative 2 charge). my teacher told me: soluble except when combined with Ca2+, Ba2+, Sr2+, Pb2+... however, other sources sometimes include Hg(II) 2+, and some Ag+, and...
  48. J

    Solving Kirchoff's Rules - Circuit Analysis Practice

    Homework Statement In the circuit of Figure P28.28, determine the current in each resistor and the potential difference across the 200-ohm resistor. Homework Equations Kirchoff's Rules V=IR The Attempt at a Solution The way I did it was like this: I set up a system of...
  49. J

    DeMorgans laws and rules of logic

    Homework Statement (p -> q) has an unambiguous meaning both in logic and in natural language. The DeMorgans laws tell us what is meant by the negation of a conjunction or the negation of a disjunction, but what is the negation of a conditional such as p -> q? Use the rules of logic to produce...
  50. S

    Feynman rules & diagram for phi^3 theory

    I'm reading a course in Introduction to QFT and I'm stuck at a problem. I'm hoping someone here could point me in the right direction or say if my assumptions are incorrect. Homework Statement Derive the Feynman rules and all diagrams at tree-level for \lambda \phi^3 theory using Wick's...
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