Opišemo surjektivne aditivne preslikave ▫$\theta : A \to B$▫, ki ohranjajo ničelne produkte, kjer je ▫$A$▫ kolobar z netrivialnim idempotentom, ▫$B$▫ pa prakolobar. Poleg tega karakteriziramo tudi ...surjektivne aditivne preslikave ▫$\theta : A \to B$▫, za katere za vsaka ▫$x,y \in A$▫ velja ▫$\theta(x) \theta(y)^\ast = 0$▫ natanko tedaj, ko je ▫$xy^\ast = 0$▫. Pri tem je ▫$A$▫ enotski prakolobar z involucijo, ki vsebuje netrivialen idempotent, ▫$B$▫ pa prakolobar z involucijo.
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