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The Posterior Analytics is a text from Aristotle's Organon that deals with demonstration, definition, and scientific knowledge. The demonstration is distinguished as a syllogism productive of scientific knowledge, while the definition marked as the statement of a thing's nature, ... a statement of the meaning of the name, or of an equivalent nominal formula.
In the "Prior Analytics", syllogistic logic is considered in its formal aspect; in the Posterior it is considered in respect of its matter. The "form" of a syllogism lies in the necessary connection between the premises and the conclusion. Even where there is no fault in the form, there may be in the matter, i.e. the propositions of which it is composed, which may be true or false, probable or improbable.
When the premises are certain, true, and primary, and the conclusion formally follows from them, this is demonstration, and produces scientific knowledge of a thing. Such syllogisms are called apodeictical, and are dealt with in the two books of the Posterior Analytics. When the premises are not certain, such a syllogism is called dialectical, and these are dealt with in the eight books of the Topics. A syllogism which seems to be perfect both in matter and form, but which is not, is called sophistical, and these are dealt with in the book On Sophistical Refutations.
The contents of the Posterior Analytics may be summarised as follows:
The second book Aristotle starts with a remarkable statement, the kinds of things determine the kinds of questions, which are four:
The last of these questions was called by Aristotle, in Greek, the "what it is" of a thing. Scholastic logicians translated this into Latin as "quiddity" (quidditas). This quiddity cannot be demonstrated, but must be fixed by a definition. He deals with definition, and how a correct definition should be made. As an example, he gives a definition of the number three, defining it to be the first odd number.
Maintaining that to know a thing's nature is to know the reason why it is and we possess scientific knowledge of a thing only when we know its cause, Aristotle posited four major sorts of cause as the most sought-after, middle terms of demonstration: the definable form; an antecedent which necessitates a consequent; the efficient cause; the final cause.
He concludes the book with the way the human mind comes to know the basic truths or primary premisses or first principles, which are not innate, because we may be ignorant of them for much of our life. Nor can they be deduced from any previous knowledge, or they would not be first principles. He states that first principles are derived by induction, from the sense-perception implanting the true universals in the human mind. From this idea comes the scholastic maxim "there is nothing in the understanding which was not prior in the senses".
Of all types of thinking, scientific knowing and intuition are considered as only universally true, where the latter is the originative source of scientific knowledge. The great work is closed as: science as a whole is...originative source to the whole body of fact.