Definition: A logical proposition is a judgment expressed in words. Just as percept and concept notions are expressed by means of logical terms so judgment notions may be expressed by logical propositions.
To illustrate: The terms the squirrel and cracking a nut express two notions, and when an agreement between them is asserted and the product is expressed in word form, then such an expression becomes the logical proposition, “The squirrel is cracking a nut.”
The following being expressed judgments are logical propositions:
(1) All men are mortal.
(2) Some men are wise.
(3) No men are immortal.
(4) Some men are not wise.
(5) No sane person is a lover of vice.
(6) Some good orators are not good statesmen.
(7) Every man is fallible.