In this chapter, we continue to study the object *N* of Theorem 21.1. Thus *k* is a finite field of characteristic *p*, Ã a nontrivial additive character of *k*, *f*(*x*) = ∑^{a}_{i=–b} *A _{i}x^{i} ∈ k*[

**Theorem 22.1.** *The object N, viewed in <N> _{geom}, is not geometrically isomorphic to the middle convolution of any two objects K and L in <N>_{geom} each of which has dimension ≥* 2.

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