Vieta's formulas

Also called Vieta's relations.

Relate the elementary symmetric functions of the roots to the coefficients of a monic polynomial.

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Ladder	Level	What the next level needs
Human proof	H0 no proof	add a proof in proofs/ (06.5)
Lean	L0 no Lean part	name a Lean module in the lean field (07)
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Writing	W0 stub	Statement one source with a locator