1 Sentences With "non formality"

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Félix, Oprea & Tanré (2008), Theorem 8.29. Non-formality can often be detected by Massey products. Indeed, if a differential graded algebra A is formal, then all (higher order) Massey products must vanish. The converse is not true: formality means, roughly speaking, the "uniform" vanishing of all Massey products.