2-1

$$\Int dx \, f(x) \delta(x-1)$$ (7)

2-1解答

$$\Int dx \, f(x) \delta(x-1) =\Int dX \, f(X+1) \delta(X)\, ; \qquad x-1 =X,\, dx=dX,\,\quad \... ... & -\infty & \to & +\infty \\ \hline X & -\infty & \to & +\infty \\ \end{array}$$

$$=f(1)$$

著者: 茅根裕司 chinone_at_astr.tohoku.ac.jp