X & the Book Code - Computerphile

Why some numbers just dont work when you're creating error proof codes. Professor Brailsford continues with the story of ISBN.

This video was filmed and edited by Sean Riley.

[Abhothra]

I see Professor Brailsford, I click.

He's one of the people on this channel who can break any concept down into tasty nibbles.

Oh oops forgot to mention : NOW send him to IBM to ask them snarky questions about their new Quantum Computer.

[schifoso]

It's such a pleasure to watch the professor. Brilliance, passion, and a gift for explaining.

[UB]

8:32 ”If you want to divide by n, it's the same as multiplying by 1/n."
_Prof. Brailsford, 2019_

[ThePharphis]

For those wondering the significance of 0 for addition and 1 for multiplication (those unfamiliar with abstract algebra) the reason is that 0 is the "identity element" for addition, and 1 is the identtiy element for multiplication ie 0 + anything = anything, and 1 x anything = anything.

This can (and is) generalized to other operations as well and the same ideas apply.

[NeilRoy]

I love all the people that are in these videos, but I have a special love for Professor Brailsford.

[Heptkaidekaphiliac]

Does this mean a sequel on Galois fields? I’ve been hoping for a computerphile video on Galois fields since I first tried to wrap my mind around AES

[SoftBreadSoft]

It's been 5 years since a Computerphile video on "extra bit" logic (ternary etc.)
I think with the recent attention to IBM's new quantum computer this would make a quite popular, and important video.

[JeaneAdix]

Can you ask the professors about design patterns. I'd like to hear a video where they talk about the gang of four and the history of design patterns

[chuckberry]

First. I apologize.
This is actually the only time I’ve been first on a video and I find it quite poetically beautiful that it has happened on a video that specifically requests that you abstain from “firsting”.

[crystalsoulslayer]

I only kinda vaguely grasp the nuances of this, but it's interesting nonetheless. And Prof. Brailsford delivers it so compellingly. Amazing presenter.

[chaoslab]

Professor Brailsford. Such a lovely chap. :-)

[MakeItStik]

Hello Professor, can you make a video on how low latency applications work - for eg Trading Applications ? What is the skill set required for developing such applications ?

[Violetlsdoingokay]

me feel big brain watching smart number video

[hellNo]

i am lost. i am not a native speaker and i seem to have lost sth there. what is the subject of the video?

[wastehq]

ISBN-10 uses descending weighting in the real world, so the check digit usually only has a weight of 1, whereas the first digit will have a weight of 10.

[aldenwilner]

Did the next video in this series ever get made?

[hrnekbezucha]

You did an episode on Unix, could you do one about BSD? That would be really nice.

[Majromax]

At 18:10 -- you have to be able to find a '1' on every single row of the table *except* the 0 row. That one gets to be special.

[nex]

1:24 Will I be able to overcome the challenge? I hope so, but turns out if you just put the first nine digits into a search engine, you get the answer immediately. Now on to watching the rest of the video ...

[i-yq]

That end smells very distinctively of polynomial division.