753
Sublime
(media.hachyderm.io)
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A collection of some classic Lemmy memes for your enjoyment
From what I understand, this idea was first printed in 1967, concurrent to but separate from this essay.
https://www.snopes.com/fact-check/father-sacrifice-son-train-bridge/
Looks like it's even earlier than that. But it puts a different spin on it if the one is a loved one. It's not really a math problem. It's an illustration of sacrifice.