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hi iamp;#39;m mark weitzman welcome back to quantum field theory of students perspective today i want to do one of our first recitations iamp;#39;ll solve a couple of problems in cerneckeamp;#39;s book problems two one two two three um these arenamp;#39;t particularly difficult but they do involve like index gymnastics and for those who arenamp;#39;t familiar with tensor manipulations and everything you might profitably um look at these but i recommend doing all these problems try them first before looking at these videos and as i said i donamp;#39;t like to ruin textbooks by doing the problems in the book so from now on iamp;#39;ll probably only do one or at most two problems of the interesting ones in a chapter so today let me start let me start as i said weamp;#39;re going to do the recitation problems 2.1-2.3 in suganecki and so letamp;#39;s start with problem number one which says that ask you to verify that equation 2.3 implies 2.8 and when reading um when reading all ph