Exact transformation formula

The supplied XVI-B source/response distinction and XII-C's retained ramp derivatives are documentary counterparts of the product-rule mechanism CheungXVIB,CheungXIIC. The fixed switched convolution of X-A-conv has its own first-order covariance obstruction and is not identified here as a successful ultraviolet regulator CheungXAconv. No formula equates ${\sigma }_{\epsilon }h$ with any of those manuscripts' cubic sources.