Sul confronto di alcune definizioni di integrale definito
One considers two strong homomorphisms, and . In Sec. 3 one finds a necessary and sufficient condition for the product to be a strong homomorphism. One also proves the following result: if is surjective or is an isomorphism, then is a strong homomorphism. In Sec. 4 it is proved that any homomorphism can be split into the product of an isomorphism and a surjective strong homomorphism except for a particular case which is then determined.
Correspondences between relational systems which are homomorphic with respect to some reference system are studied. Five types of homomorphism conditions are discussed. Normal references in which a correspondence between relational systems is a homomorphic correspondence of a certain type are examined, and the cases in which there is only one of these reference systems are determined.
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