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7-2

$\displaystyle \Int dx \, f(x)\delta(3x)$ (18)

7-2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