I have issues regarding the clarity of following definition from this source: http://www.cs.huji.ac.il/~nati/PAPERS/expander_survey.pdf (page 73) not sure about how g(v) is defined, and how, using this function, I can deduce the fact that $||g||^2=||f||^2$


  • $\begingroup$ Can anyone here help me please? $\endgroup$ – av9w Jan 15 at 8:42

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