for S, S9 being non empty non void ManySortedSign
for f being Function of the carrier of S9, the carrier of S
for g being Function st f,g form_morphism_between S9,S holds
for s1, s2 being SortSymbol of S9 st TranslationRel S9 reduces s1,s2 holds
TranslationRel S reduces f . s1,f . s2