Dirac delta function | Laplace transform | Differential Equations | Khan Academy

Introduction to the Dirac Delta Function

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Differential Equations on Khan Academy: Differential equations, separable equations, exact equations, integrating factors, homogeneous equations.

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[kaitanuba]

I really wish I was born maybe 10 years later. Because by then khanacademy would have probably covered the majority of higher college courses like Circuits and Linear Systems. I am really having a hard time understanding such courses right now due in part to the fact that my uni's lectures are nowhere as intuitive as your videos.

[robertschlesinger]

I might add a couple of credible anecdotes regarding Paul A. M. Dirac.

A French physicist came to Dirac's home to discuss some cutting edge physics. The physicist was escorted into Dirac's study and he preceded for some time, trying with great difficulty to explain his work in English to Dirac. The physicist was clearly having considerable frustration with his limited spoken English. After quite some time, Dirac's sister, Betty, entered the study with some tea and biscuits, speaking fluent French, and wherein Dirac responded in fluent French. The French physicist who had spent considerable time frustrated in trying to express himself in English inquired of Dirac: Why didn't you tell me you spoke French. Dirac replied: You didn't ask.

Another anecdote is from his days at Florida State University. The Physics Department held seminars which Dirac would often attend, sitting near the front row. He appeared to be dozing off throughout the presentations, but during the question & answer period, he would make brilliant comments and ask appropriate questions. He seemed asleep, but was all the while quite lucid.

[blueschewsmith]

Just wanted to let you know Sal, Dirac is pronounced with a harsh 'a' sound as in the end of 'attack'. We have a library at FSU named after him. I'm very proud to learn this subject at the university where the man who invented it taught.

[georgepp]

Sir, you just lighted my mind up this night and all i can do is to thank you so much!

[juanvolpacchio]

I used to view this videos 12 years ago while going through my chemical engineer bachelor's degree. Thank you very much for your content! I really appreciate your help at that time!

[jayoberlander]

Kahn, will you please make some videos dealing with topology and other higher maths? You'll probably never see this, but it's worth a try. 

[twokharacters]

This was an excellent refresher going to into senior mol. spectroscopy lab after having taken dif. eq. a few semesters ago.

[WichitaTV]

"twice the infinity" - that`s epic!

[BenG]

great video. clear voice, interesting tone, clear descriptions = win!

[tyomero]

Thanks! I'm trying to understand the neural response function and this was very helpful, I didn't get that the value of the integral is part of the definition. Thanks!

[OriginalSchaffino]

It's midnight and I have school tomorrow but this is interesting; I love math.

[uteroot]

helpful! i see your video when i taking linear algebra last semester. now i takes signals and system course and i need you too! thanks a lot a lot!!!

[quintinmakwe]

Absolutely blown away! Please how can one come up with intuition like this around any topic?

[BoZhaoengineering]

the best interpretation of Delta function. intuitive.

[ninabutterfly]

very interesting video, thank you Khan Academy.

[johnteoss]

Thank you :) U helped me understand whats behind all the things my lecturer tought in class haha, good job!

[mookieoftheshire]

Sal was beating dead horses for 17 minutes

[atogh]

i am done watching but best explanation so far

[tonmandude]

Sometimes, I wish my professor's would explain it like this.

[LokendraSD]

Thank You! It was very helpful introduction to Dirac delta function!