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Copernicus proposed heliocentrism in 1543 and it is still relevant today. Some fields just seem to stagnate, I guess.

It’s not stagnation but the fundamental truths of a system, just like how 2 + 2 = 4 will remain true forever.

In the algebra course one of the assignments was actually to prove that 2 + 2 = 4.

In a ring with a unit.