The Two Generals’ Problem

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Time to tell a story about idempotency, computer science, and the Night of the Multiple Orders. • Sponsored by Dashlane —try 30 days for free at: dashlane.com/tomscott

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Written by Sean M Elliott and Tom Scott
Directed by Tomek
Graphics by Mooviemakers mooviemakers.co.uk/
Audio mix by Haerther Productions haerther.net/

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Jo 1337
Jo 1337
06 December 2019

It's 2 am and I regret nothing

Vysair
Vysair
03 December 2019

Or maybe both general could send dozen more message until it hit certain threshold and that will confirm it.

10k12
10k12
02 December 2019

2:35 why not let them meet in the middle, so if they perish, they perish together and no message is received, but if they manage to meet, they can return and there are no threats on the way back to the generals.

Payoneer
Payoneer
07 December 2019

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Shaurya Pant
Shaurya Pant
01 December 2019

Well, after both the teams have received confirmation of the other party that they know that you know and will go at 8PM, I don't see any further need of sending messengers. Can someone explain, please?

Andre L
Andre L
01 December 2019

How come this problem exists at all, if the proposed time is 8 pm, and both of them acknowledged the acknowledgments, then why would A and B need to keep sending acknowledgments? They both acknowledged the proposal and acknowledgment, so it's already planned? They both already know that it made it to the other side at least twice, so what's the problem? This just feels like it's not really a problem.... How is this line of reasoning incorrect?

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07 December 2019

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Markus B
Markus B
01 December 2019

I should be asleep but general B didn’t give me a confirmation

john wick
John wick
01 December 2019

Simply. General A sends a messenger which returns after delivery of the message. If the messenger does not return after a suitable time span. It is safe to assume something happend and another messenger needs to be sent

Walter Scott
Walter Scott
01 December 2019

To the timid and hesitating everything is impossible because it seems so.

Space Griffin
Space Griffin
30 November 2019

but wouldn't a and b know they've received the message by the third message?

DukeOfEarle88
DukeOfEarle88
29 November 2019

£7.74 word.

UberKrassMann
UberKrassMann
29 November 2019

2:55 starts sweating.....

Chuck Norris
Chuck Norris
07 December 2019

Someone once tried to tell Chuck Norris that roundhouse kicks aren't the best way to kick someone. This has been recorded by historians as the worst mistake anyone has ever made.

Skepty
Skepty
28 November 2019

Just tell them to make a fire signal after they do, as confirmation. Not that hard.

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