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2-3

$\displaystyle \Int dx \, f(x)\delta(-3x)$ (9)

2-3解答

$\displaystyle \Int dx \, f(x)\delta(-3x)$ $\displaystyle = \Int\frac{dX}{3} f(-X/3) \delta(X)\, ; \qquad -3x =X,\, -3dx=dX... ... & -\infty & \to & +\infty \\ \hline X & +\infty & \to & -\infty \\ \end{array}$    
  $\displaystyle =\frac{f(0)}{3}$    


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著者: 茅根裕司 chinone_at_astr.tohoku.ac.jp