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Math nerds have entered the chat! This meme is playing with the abbreviation "RNG" which typically means "Random Number Generator" in computing and gaming. But in mathematics, "Ring without multiplicative identity" is actually a specific algebraic structure that's way more elegant (and pretentious).
In abstract algebra, a ring is a set with two operations (addition and multiplication) that satisfy certain properties. When a ring has no multiplicative identity (no element that acts like "1"), mathematicians literally just call it a "rng" - pronounced exactly like "ring" but with the spelling reflecting its incomplete nature.
It's basically mathematicians showing off their superior taste in random things. Computer scientists just want chaos machines, but algebraists prefer their randomness with elegant structural properties!
