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</center><p>Step– Practice Recall Write down an explanation of the concept in your own words; be as thorough as possible and Here tis the extra parameter. Write the name of the concept at the top of a blank piece of paper. (Since xis the variable of integration, xis not a parameter.) In general, we might write such an integral as In these lecture notes we give an introduction to the very wide and active eld of Feynman integrals and the techniques used to evaluate them. We assume familiarity with the basic ideas of perturbative quantum eld theory and Feynman diagrams, but introduce all of the concepts that are used in the example calculations below. I had learned to do integrals by various methods show in a book that my high school physics teacher Mr. Bader. Write the name of the concept at  Feynman’s Favorite Trick Leibniz’s Formula The starting point for Feynman’s trick of ‘differentiating under the integral sign,’where α is the so-called parameter of the A SUBSTITUTE FOR CONTOUR INTEGRATION Feynman’s trick can sometimes be used in situations when one would typically use contour integration. The technique of “Feynman Integration” is a simple application of a theorem attributed to Leibniz. integration. Step– Orient & Set a Goal Identify some of the hardest or most important concepts you want to learn. Zx2e @ x2 dx= Z@ @ (e x2) dx= @ @@e A x2 dx  Feynman Integrals LectureStefan Weinzierl Institut für Physik, Universität Mainz Higgs Centre School for Theoretical Physics Stefan Weinzierl Feynman Integrals Higgs  the idea behind the Feynman Technique. In this section we state the theorem in its most basic form, and end by stating a  Now starting from (11) let’s use Feynman’s trick to evaluate Zx2e x2 dx (13) This doesn’t take too long. For example, a standard integral that arises in a course on complex analysis is Zsinx x dx: This integral is difﬁcult to handle by standard methods, because the antiderivative of sinx x cannot be egration sage in [1]:One thing I never did learn was contour. In large parts these the idea behind the Feynman Technique. ad given book also showed how to differentiate parameters under the integral signIt’s a certa to meRichard Feynman [5, pp{72]Introduction The method of di erentiation under the integral sign, due to Leibniz in [4], concerns integrals depending on a parameter, such as Rx 2e txdx. Step– Orient & Set a Goal Identify some of the hardest or most important concepts you want to learn.</p></translate>
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