the.com/theorem

a promise that, once proven, the universe is contractually obligated to keep forever

means A statement in mathematics or logic that has been (or can be) proven true by following from accepted axioms and prior results.

from From Greek 'theorema,' meaning 'a thing looked at, a sight, a spectacle,' built on 'theorein,' 'to look at, contemplate' — the same root that gives us 'theory' and even 'theater.' To the Greeks a theorem was literally something you beheld with the mind's eye: a truth viewed and considered until it became undeniable. It reached English in the 16th century by way of Latin 'theorema.'

unproven cousin
A conjecture is a theorem before it earns its diploma
longest proof
Classification of finite simple groups spans tens of thousands of pages
Greek origin
From theorema, meaning a thing contemplated or beheld
machine-checked
Computers now verify proofs humans struggle to finish
Fermat's troll
His margin note waited 358 years for a proof
for instance

pythagorean theorem — a² + b² = c² for right triangles, proven by pythagoras around 500 bce

fermat's last theorem — no three positive integers satisfy xⁿ + yⁿ = zⁿ for n > 2, proved by andrew wiles in 1995

central limit theorem — distribution of sample means approaches normal distribution, foundational to statistics and probability

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