The -order audit

Consequently, a physical convention

would, under the conditional hypotheses, be determined only through ${\hslash }^2$ by the order-three data. A normalized result through ${\hslash }^3$ requires the numerator through ${\hslash }^4$, or a separately specified equivalent convention. There is no inverse of $\hslash$ in $\mathbb{C}[\hslash ]/({\hslash }^4)$.

Higher retarded maps additionally require higher time-ordering and all intermediate free products in their defining identities DF. Neither the binary implication nor the triangle coefficient constructs $R_2$, and the inherited partial domain does not authorize unspecified intermediate products.