What is Rules: Definition and 537 Discussions

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

    Solving for n: power and log rules refresh

    Homework Statement A computer can perform 1010 ops/s. Assume 1 op per 1 input. Given the following algorithmic complexities how many inputs can be performed in an hour. n2 n3 100n2 n log n 2n 22n Homework EquationsThe Attempt at a Solution [/B] C = 1·1010 ops/s · 3.6·102 s/hr C = 3.6·1012...
  2. P

    I Selection rules for multiphoton vs single-photon ionization

    Question: For ionization of a homonuclear diatomic, how do the selection rules differ for a nonresonant 2-photon ionization process and a 1-photon ionization process?
  3. J

    A Srednicki's QFT: Feynman Rules and Feynman Diagrams

    I'm reading Srednicki's Quantum Field Theory. I 'm trying to read Srednicki's presentation of Feynman Diagrams in the chapter Path Integral for the Interacting Field Theory. Link to the book: The path integral for the phi-cubed theory is equation 9.11 in the book. Please read that. I get the...
  4. E

    A Selection rules in IXS and EELS

    Hello everybody, since I have to plan an experiment to map the energy-momentum dispersion of a bosonic excitation, I have a question related to the difference between the excitations probed by Inelastic X-ray Scattering (IXS) and Electron Energy Loss Spectroscopy (EELS). Both the techniques are...
  5. N

    MHB Clarifying some rules on solving quadratic equation

    Hello! I just want to clarify something about the rules on solving quadratic eqns. I have already solved both problems but in the process of my solution some questions arise. For example in the part of my soltution in problem 48 I have this...
  6. Ackbach

    MHB Discuss Ten Simple Rules for Effective Statistical Practice

    I came across this article, called "Ten Simple Rules for Effective Statistical Practice", and thought it was monumental in its importance for understanding statistics and using it practically, particularly in science. I hope you enjoy it!
  7. P

    Application of derivative rules in physics

    Homework Statement Hi everyone, I'm currently working on year 12 maths and am able to answer questions in the maths book for the various rules of differentiation (chain, product, quotient) and can determine which questions should be answered using which rules. But in the maths book, the...
  8. F

    Rules of choosing repeating variable in Buckingham pi theorem

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  9. Kuzon

    Struggling with the rules behind electricity

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  10. R

    Finding currents using the junction and loop rules

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  11. J

    I Transition rules for a trapped ion

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  12. G

    Integral to show selection rules

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  13. J

    Electric Circuit using Kirchoff's rules

    Homework Statement We are given that R1 = 15.0 Ω, R2 = 10.0 Ω, and R3 = 8.00 Ω. What is the current and direction of the current through each resistor? Again, I have no idea how to do this, I got my answer from chegg, but I don't know if this is correct. Homework Equations V = IR[/B]The...
  14. kq6up

    Trying to understand Selection Rules in Cohen-Tannoudji

    On the bottom half of page 249 Cohen-Tannoudji it talks about selection rules in terms of off diagonal elements of the matrix generated by ##\langle \phi _{ n^{ \prime },\tau ^{ \prime } } \mid \hat { B } \mid \phi _{ n,\tau } \rangle##. I thought all off diagonal matrix elements would be...
  15. terra

    SU(2) lepton doublet conjugation rules

    I have a left-handed ##SU(2)## lepton doublet: ## \ell_L = \begin{pmatrix} \psi_{\nu,L} \\ \psi_{e,L} \end{pmatrix}. ## I want to know its transformation properties under conjugation and similar 'basic' transformations: ##\ell^{\dagger}_L, \bar{\ell}_L, \ell^c_L, \bar{\ell}^c_L## and the general...
  16. S

    Solving Erbium's Ground State w/ Hund's Rules

    I have the solution for this problem but don't understand it. 1. Homework Statement Use Hund's rules to calculate the ground state of erbium with electron configuration [Xe]4f126s2 Homework Equations Hunds Rules: 1. Maximise S (within Pauli) 2. Maximise L (within Pauli) 3. Min J (for...
  17. levadny

    About road rules in your country

    Dear All. My hobby is road traffic and road rules. For me is very interest rules in other countries. I want read official text of rules in your country. Please add link for official text if you know. In English please if you can. My English is not good. I search in Google but not got correct...
  18. J

    The Laws and Rules of Emergence in Spacetime and Matter Fields

    Are their specific laws or rules in emergence? For example, temperature is emergence from the underlying particles. Superconductivity is emergence from the cooper pairs. It seems you can turn off emergence by say increasing the temperature to disable the cooper pairs. In temperature, how do you...
  19. A

    Confusion about selection rules

    While I am reviewing my undergrad physics for qualifying exam, I became confused about the numerous selection rules. (1) We have the selection rules for spontaneous emission in a hydrogen atom: Δl=±1 ,Δml=0,±1. This rule is the easiest to understand by evaluating <n'l'm'|z|nlm> (2) We have the...
  20. S

    Fortran Rules for Fixed Format Fortran: A Comprehensive Guide

    Are there any rule guides on fixed format Fortran such as in .f77, .f, .for files? For example, http://www.physics.nau.edu/~bowman/PHY520/F77tutor/03_basics.html has a few snippets of rules for Fortran 77 such as Col. 1 : Blank, or a "c" or "*" for comments Col. 1-5 : Statement label...
  21. H

    Using Feynman rules to calculate amplitude

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  22. Gh. Soleimani

    I Are These Rules new Conjectures in Set Theory?

    We can easily find out below rules in set theory: 1. Let consider set “A” as follows: A = {a1, a2, a3, a4… an} and also power set of A is set C: C = {{}, {a1}, {a2}, {a3}, {a4}, {a1, a2}, {a1, a3},….{an}} Rule 1: To find the number of subsets with precise members number, we can use Binomial...
  23. H

    What rules governs the mutual induction

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  24. S

    Feynman rules for Lagrangian with derivative Interaction

    Homework Statement The lagrangian is given by: L = \frac{1}{2} \partial_{\mu} \phi \partial^{\mu} \phi + \frac{\alpha}{2} \phi \partial_{\mu} \phi \partial^{\mu} \phi And the question is to find the feynman rules. Homework EquationsThe Attempt at a Solution I started by using the...
  25. Z

    Math Rules: Learn Essential Math Principles Easily

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  26. S

    Quantum Functional Integration and Feynman rules

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  27. temp050505

    Selection rules for Hydrogen

    Good afternoon, Does the selection rules have a condition on \Delta n ? I have not found a website or a book that show transitions between 2S_{1/2} and 2P_{3/2}, that's why I was wondering if \Delta n = 0, with respect to the other selection rules, are allowed transitions. Thank you for your...
  28. ShayanJ

    Superselection rules and non-observable Hermitian operators

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  29. Fancypen

    What are the rules to know when to use absolute value?

    Specifically when doing integration problems. I know the indef integral of cosx/sinx+1 is ln(sinx+1) + C, but absvalue is not required here. I think it's because the sine fn must be >= 0 or it's undefined? What about in other cases, is there a general rule to know when to use absvalue? Thanks
  30. uselesslemma

    Collisional excitation: selection rules for rotations?

    To be specific, I am referring to CO molecules undergoing collisions with H2, resulting in CO transitioning to an excited vibrational state. I can't seem to find any rotational selection rules for collisions, meaning ΔJ could be essentially anything, as long as energy and angular/linear momentum...
  31. T

    Cutkosky Cutting Rules: Understanding Rules & Where To Add i

    OKay, so whenever I run into explanations on the cutting rules, most of the time I see the statement to replace##\frac{1}{p^2 - m^2 + i\epsilon} \rightarrow -2i\pi \delta(p^2 - m^2)## for each propagator that has been cut taking note that there is no factor of i in the numerator for...
  32. StevieTNZ

    England's Court of Appeal Rules On Meaning of 'One'

    http://www.independent.co.uk/news/science/what-exactly-does-one-mean-court-of-appeal-passes-judgement-on-thorny-mathematical-issue-10350568.html Thoughts?
  33. Stephanus

    Understanding 0: How Maths Rules Changed Through Time

    Dear PF Forum, I just read Math FAQ Please confirm. These rules are not int practice. Is this true? Because 30 years ago in high school, I was taught. x/zero is infinity, error in computer. zero/zero is undefined, not zero. Also error in computer. So zero/zero is undefined or zero? Thanks for...
  34. scharry03

    Kirchhoff's Rules Circuit Problem

    Homework Statement Where V1 = 14V and V2 = 10V, solve for I1, I2, and I3. Homework Equations DeltaV = IR Sigma(I) at junction = 0 Sigma(DeltaV) of loop = 0 The Attempt at a Solution I began by assuming clockwise direction of the loops, to determine the signs of the resistance to follow. I...
  35. S

    Rules for working with approximation data

    According to rules for working with approximate data, why the final result of a multiplication or division involving approximation data is round off so that the result has as many significant digits as the given data with the fewest significant digits? How is this rule established? For example...
  36. andrex904

    Euclidean Feynman rules for QED

    Hi, i have some trouble with feynman rules after wick's rotation. I don't understand how the propagators transform. In particular if i take the photon's propagator in minkowskian coordinates i don't understand where the factor "-i" goes after the transformation. ## \frac{-i\eta_{\mu\nu}}{p^2}...
  37. V

    What are the mathematical rules for adding consecutive numbers and squares?

    I have recently discovered some mathematical rules by trial and error. Some of these may be already known to people of mathematics. 1. This one is common: Sum of all integers 1+2+3+...=0.5(n^2 + n) 2. Sum of odd integers: 1+3+5+7+9...= n^2 3. Sum of even integers: 2+4+6+8...= n^2 + n eg...
  38. A

    Fleming's Left and Right Hand Rules

    Hi, I was wondering if anyone has any advice on when to use FLHR and FRHR in the Edexcel A - Level Physics, as I'm mixing them up in questions. Thanks, Abby
  39. Rajkovic

    Measurement Rules Quantum Universe

    Is a new article, btw June 2, 2015 Experiment Provides Further Evidence That Reality Doesn't Exist Until We Measure It http://www.iflscience.com/physics/measurement-rules-quantum-universe http://www.sciencealert.com/reality-doesn-t-exist-until-we-measure-it-quantum-experiment-confirms any...
  40. stevendaryl

    Von Neumann QM Rules Equivalent to Bohm?

    Bohm's deterministic theory was designed to be equivalent to standard QM, but what I'm not sure about is whether that includes Von Neumann's rules. Von Neumann's rules for the evolution of the wave function are roughly described by: Between measurements, the wave function evolves according to...
  41. H

    Feynman rules for nonlinear sigma models

    Nonlinear sigma models are particular field theories in which the fields take values in some nontrivial manifold. In the simplest cases this is equivalent to saying that the fields appearing in the lagrangian are subject to a number of constraints. Since the lagrangian fields are not independent...
  42. L

    Feynman rules for Yukawa theory

    Hi. Do you know any book/paper/lecture notes where I can find complete derivation of Feynman rules for both scalar and pseudo-scalar Yukawa theory, and maybe an example of application to decay of fermion?
  43. K

    Kirchhoff's Rules: Solve 9V Battery Circuit

    Homework Statement A circuit contains 9V battery ,which internal resistance is unknown, an ammeter and a voltmeter, whose resistances are also unknown. When a resistor was connected to the voltmeter in parallel, the voltmeter's value was reduced 2 times and the ammeter's value doubled. What did...
  44. blue_leaf77

    Selection rules in electric dipole appoximation

    Some literatures say that the selection rule in electric dipole approx. for angular momentum ##\Delta j = 0,-1,1## some other say ##\Delta l = -1,1##. I follow the notation used in my references, despite the difference I think since j and l are both angular momenta which fulfill angular momentum...
  45. Quarlep

    A Physical Situation Which Physics Rules Collapse

    Whats the circumtances which physics rules collapse and don't work.Theres any explanation it to use mathematics. Here I don't mean singularity things.I know in singularity physics rules collapse I want to talk more generally.
  46. F

    Why doesn't orbital angular momentum operator L commute with scalar operator S?

    So the total angular momentum operator J commutes with any scalar operator S. The argument for this is that J is the generator of 'turntable rotations' (by this I mean we rotate the whole object about an axis, along with its orientation) and the expectation value of any scalar operator has to be...
  47. R

    Transformation rules in Boolean algebra

    I know De-Morgan's law that $$ -(p∧q) = -p∨-q $$ Also $$ -(p∨q) = -p∧-q $$ But for material implication and bi conditional operations there are also some transformation. What is the law or proof for it? Like $$ p⇒q = -p∨q $$ $$ p ↔q = (p∧q) ∨ (-p∧-q) $$ There may be other properties also that I...
  48. Fallen-S36

    Bending the Rules (Gamma ray lenses)

    http://news.sciencemag.org/sites/default/files/styles/thumb_article_l/public/article_images/sn-gammarays.jpg?itok=vYTMw8My Researchers at Institut Laue–Langevin have found a way to bend gamma rays. Gamma ray lenses, which theory had suggested were impossible, could be made from heavy elements...
  49. PcumP_Ravenclaw

    Factorizing determinants and rules to simplify them

    Homework Statement 2. Evaluate the determinants ## \begin{vmatrix} 1 & 1 & 1\\ x & a & b \\ x^2 & a^2 & b^2 \\ \end{vmatrix} ## ## \begin{vmatrix} x & a & b \\ x^2 & a^2 & b^2 \\ x^3 & a^3 & b^3 \\ \end{vmatrix} ## and factorize both answers. Homework Equations Rules of determinants are...
  50. R

    Rules in determining family of planes in Hexagonal

    Hi guys, I'm assume that you already know the 7 crystal system, each crystals have unique way of determining the family of planes, for example in cubic, we all know (111) plane is same (-1-1-1), and so on ((-1-11),(-11-1)...) a total of 8, in fact there is pattern to determine how many possible...
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