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Existential import, in syllogistic, the logical implication by a universal proposition (i.e., a proposition of the form "All S is P" or "No S is P") of the corresponding particular statement (i.e., "Some S is P" or "Some S is not P," respectively).
Consider a true universal proposition, say the proposition that every finger of my right hand is less than 1m long.
In such situations, it is best not to make one's argument depend upon securing agreement about any universal proposition.
The argument from likeness is thus clearly distinct from the paradeigma, where the universal proposition plays an essential role as an intermediate step in the argument.
And, contra Mill's inductivism, because we have direct experience of generality and of relations, a single instance is sufficient to establish the universal proposition (say, that all glass is brittle).
Nor does the universal proposition assert that some class relation holds between A and B – the assertion of a class relation is just a way of saying that certain propositions are true.
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But in slightly later works, such as 'On Denoting' (1905), propositional functions are said to be constituents of universal propositions.
Briefly, only universal propositions distribute the subject term (S), and only negative propositions distribute their predicate (P).
Obviously, universal propositions, such as "All cats have claws," being only partially supportable by positive instances (one cannot examine every cat that exists), are not conclusively verifiable.
He considers that it is not necessary to prefix a universal quantifier to universal propositions.
Such truths are derived from other universal propositions and tested in experience.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com