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2.4.1 Generalized Assumptions

Take this sentence first: “A parent is a father or (a) mother.

By using the conjunction “or” the first sentence can be dissected in two singular definitions:
• “A father is a parent.
• “A mother is a parent.

Now take the following sentences:
• “A father is a parent.
• “John is a father.” or “John is the father of Pete.

It is now clear that the specification word of the sentence about “John” is the same as the generalization word of the definition sentence. Therefore, we may make a specification substitution conclusion.

So from the original sentence, “A parent is a father or (a) mother.”, and the sentence, “John is the father of Pete.”, we can conclude that “John is a parent (of Pete).”.

This 'conclusion' we call a generalized assumption, because the noun specification of a sentence may be replaced by the generalization of an exclusive specification collection of an (original) definition sentence.

A generalization often has exceptions, therefore it is an assumption and not a conclusion.