- #1

- 285

- 13

For two variables ##x## and ##y##:

\begin{equation}

\begin{split}

\delta(x-y) f(x) &= f(y)

\end{split}

\end{equation}

And:

\begin{equation}

\begin{split}

\delta(x-x) f(x) &= f(x)

\end{split}

\end{equation}

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- I
- Thread starter redtree
- Start date

- #1

- 285

- 13

For two variables ##x## and ##y##:

\begin{equation}

\begin{split}

\delta(x-y) f(x) &= f(y)

\end{split}

\end{equation}

And:

\begin{equation}

\begin{split}

\delta(x-x) f(x) &= f(x)

\end{split}

\end{equation}

- #2

Staff Emeritus

Science Advisor

Education Advisor

- 31,239

- 17,421

Neither of those is correct.

- #3

Gold Member

- 573

- 180

Ssnow

- #4

Science Advisor

Homework Helper

Gold Member

- 8,096

- 3,730

So in your question, ∫δ(x-y)f(x)dx = f(y) would make better sense than your expression (1). The integral can not be omitted. Your expression (2) does not make sense to me.

Share:

- Replies
- 2

- Views
- 592

- Replies
- 2

- Views
- 1K

- Replies
- 3

- Views
- 689

- Replies
- 4

- Views
- 1K

- Replies
- 9

- Views
- 2K

- Replies
- 7

- Views
- 1K

- Replies
- 6

- Views
- 4K

- Replies
- 2

- Views
- 2K

- Replies
- 4

- Views
- 510

- Replies
- 8

- Views
- 2K