On Interpretation
Peri Hermēneias (De Interpretatione) — Aristotle's short treatise on propositions, opposition, and the famous sea-battle argument
Tradition: Classical Greek philosophy / Aristotelian logic
Names, verbs, propositions, opposition, and the famous sea-battle argument that haunted Western philosophy for two thousand years
On Interpretation is the second book of Aristotle's Organon and the foundational text in the philosophy of language and logic. Its fourteen short chapters develop the basic categories of declarative speech: names and verbs are signs of mental affections; affirmations and negations have opposition relations (contradictory, contrary, subcontrary); modal claims have their own logic. The work's most famous passage is the chapter 9 "sea-battle" argument: if "there will be a sea battle tomorrow" is now either true or false, then the future is fixed, and human deliberation is in vain. Aristotle's response — that future contingents may be neither determinately true nor determinately false — generated two millennia of philosophical debate on bivalence, fatalism, and the nature of truth. The work shaped medieval logic (the doctrine of supposition, the analysis of consequentiae) and modern analytic philosophy of language (Frege, Russell, Quine all engage it).
Author
Editions cited
- Categories and De Interpretatione (J. L. Ackrill, Oxford, 1963)
- The Complete Works of Aristotle (Jonathan Barnes, Princeton, 1984)
- On Interpretation (with extensive commentary by Boethius, ed. and trans. by Andrew Smith, Oxford, 2010)
School Embodiments
On Interpretation is foundational for the analytic philosophy of language. The sea-battle chapter is a continuing reference in debates about future contingents, bivalence, and temporal logic (Arthur Prior).
"For if every affirmation or denial is true or false, every existent thing must necessarily be." (De Int 9, 19a35)
The book defends ontological realism — there are real mental affections corresponding to real things, and language signifies through this correspondence.
"Spoken words are the symbols of mental experience; written words are the symbols of spoken words. Mental experiences are the same for all men." (De Int 1, 16a3)
The substance-property metaphysics of the Categories carries through into the proposition analysis of On Interpretation. Aristotelian logic and metaphysics are mutually informing.
"A name is a sound significant by convention, which has no reference to time." (De Int 2, 16a19)
Boethius's commentaries on On Interpretation were the principal medieval logic textbooks; Aquinas's commentary develops the relation between propositional truth and divine foreknowledge (the sea-battle problem becomes the problem of God's knowledge of future contingents).
"In things future and contingent, truth and falsity are not yet determined." (De Int 9, as glossed by Aquinas, ST I.14.13)
Al-Farabi and Avicenna wrote substantial commentaries on On Interpretation. The sea-battle problem becomes central to Islamic discussions of divine foreknowledge and human free will.
"Future contingents are determinate from God's eternal perspective." (Avicenna, glossing De Int 9)
The Vienna Circle and its successors take Aristotle's analysis of propositions as the starting point for twentieth-century philosophy of language, though they modify it heavily.
"Every proposition is either true or false." (De Int 9, as the bivalence thesis later attacked by Łukasiewicz and others)
Leibniz develops a Latin logical calculus from the Aristotelian apparatus of On Interpretation, aiming at a "characteristica universalis."
"The square of opposition contains the basic logical relations." (De Int 7, the foundation of subsequent logical algebra)
The sea-battle problem is process-philosophy's classical statement: a genuinely open future requires that future-tensed propositions about contingents not yet be determinately true.
"It is plain that not everything is or comes to be of necessity." (De Int 9, 19a18)
The work treats logical-linguistic structures as articulating real-world relations — language tracks reality, with the working ontological realism characteristic of practical Aristotelian method.
"Names and verbs by themselves are not yet propositions." (De Int 4, 17a17)
The implicit dialogue with Plato's Cratylus — what is the relation between names, mental images, and the realities they signify — runs throughout On Interpretation.
"Words signify in virtue of mental affections, mental affections in virtue of the things they resemble." (De Int 1, summarising the semantic thesis)
Internal Tensions
The sea-battle problem generates a continuing tension in Aristotelian logic between bivalence (every proposition is true or false) and the open future. Łukasiewicz developed three-valued logics partly in response. The medieval Christian gloss (God's eternal present sees all times) and the Islamic gloss (Avicennan necessity) both close off the openness Aristotle himself seemed to leave. Whether Aristotle is best read as rejecting bivalence for future contingents (the Ackrill reading), or only rejecting their determinate truth-value while preserving bivalence (the Whitaker reading), remains contested.
I. Time
The sea-battle chapter is the canonical text on open future and the logic of future contingents.
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II. Space
Newtonian background space; the work's subject is logical-linguistic structure, not physical space.
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III. Matter
Spoken and written words as the conventional symbols of natural mental affections.
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IV. Observer
The rational speaker-thinker, whose mental affections are the same for all humans (the famous 16a7 claim of psychological universalism).
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V. Energy
Not addressed; the work is conceptual-logical, not physical.
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VI. Information
Linguistic and logical information; discrete, preserved through inscription and transmission.
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Personas that cite this work
Personas with the nearest attribute fingerprint
Historical figures whose own classification on the same six-dimensional grid lands closest to this work's. Computed by attribute-agreement on coordinates both address.
Computed school proximity
The work's attribute fingerprint scored against all schools using the same quiz scorer. Useful as a sanity check on the hand-curated embodiments above.
How On Interpretation resolves each dilemma
51 resolved positions across 4 dimensions, including 3 distinctive where the majority of schools go the other way · 6 unaligned.
Each dimension is sorted so minority positions come first. Mainstream positions are folded into an expandable list.
Time · 9 dilemmas, all mainstream
Matter · 7 dilemmas, all mainstream
Observer · 37 dilemmas · 3 distinctive
Mind, agency, and the knower's relation to the known.