Preservation of the free equations

The polynomial field algebra and the free differential › Preservation of the free equations · lines 901–906

The eliminated relations then give $s_{0}^{2} c ˉ = \frac{i}{2} □ c = 0$ in the free-shell algebra, while independent $b$ already provided off-shell nilpotence.

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lemma: Lemma: Stability of the equation ideal