The Art of Logical Thinking; Or, The Laws of ReasoningAtkinson, William Walker
Philosophy
The Art of Logical Thinking; Or, The Laws of Reasoning
Atkinson, William Walker
Logic; Reasoning
When a Judgment is expressed in words it is called a Proposition. There
is some confusion regarding the two terms, some holding that a Judgment
and a proposition are identical, and that the term "proposition" may be
properly used to indicate the judgment itself. But the authorities who
seek for clearness of expression and thought now generally hold that:
"_A Proposition is a Judgment expressed in words._" In the next chapter,
in which we consider Propositions, we shall enter into a more extended
consideration of the subject of Judgments as expressed in Propositions,
which consideration we omit at this point in order to avoid repetition.
Just as the respective subjects of Concepts and Terms necessarily blend
into each other, so do the respective subjects of Judgments and
Propositions. In each case, too, there is the element of the mental
process on the one hand and the verbal expression of it on the other
hand. It will be well to keep this fact in mind.
CHAPTER IX.
PROPOSITIONS
We have seen that the first step of Deductive Reasoning is that which we
call Concepts. The second step is that which we call Propositions.
In Logic, a _Proposition_ is: "A sentence, or part of a sentence,
affirming or denying a connection between the terms; limited to express
assertions rather than extended to questions and commands." Hyslop
defines a Proposition as: "any affirmation or denial of an agreement
between two conceptions."
_Examples of Propositions_ are found in the following sentences: "The
rose is a flower;" "a horse is an animal;" "Chicago is a city;" all of
which are affirmations of agreement between the two terms involved; also
in: "A horse is not a zebra;" "pinks are not roses;" "the whale is not a
fish;" etc., which are denials of agreement between the terms.
The _Parts of a Proposition_ are: (1) the _Subject_, or that of which
something is affirmed or denied; (2) the _Predicate_, or _the
something_ which is affirmed or denied regarding the _Subject_; and (3)
the _Copula_, or the verb serving as a link between the Subject and the
Predicate.
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