Backward differentiation formulas

Also called BDF methods, Gear's methods.

Implicit multistep methods used for stiff ODEs, zero-stable up to order six.

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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	the section The problem pseudocode in The algorithm complexity claims in the front matter one source with a locator