What do Pythagoras, Euler, Roche-Frobenius, Thales and Mean Value have in common?

Question: What do Pythagoras, Euler, Roche-Frobenius, Thales and Mean Value have in common?

Options:

They’re mathematic operations
They’re mathematicians
They’re mathematic theorems
They’re physical principles

Correct answer:

They’re mathematic theorems

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