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A comment on Frontier AI has broken the open CTF format. Parent comment

Re:Frontier AI has broken the open CTF format by mr_mitm on Saturday May 16, 2026 @04:41PM (#48163595)
The concepts of rest mass and relativistic mass are considered outdated. In modern physics, "mass" means what they meant by "rest mass".

Here some indication I'm not making this up: https://hsm.stackexchange.com/questions/2465/when-and-why-di...

In any case, I never use those concepts, and I know no professional particle physicist that does. By "mass", I mean rest mass.

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Re:Frontier AI has broken the open CTF format by tardedmeme on Sunday May 17, 2026 @04:39PM (#48172995)
When you put a photon in a stationary box, the "relativistic mass" of the photon becomes part of the "rest mass" of the photon-box system. You can't ignore it.
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