Authors: Héctor Ciocchini, José E. Burucua & Omar Bagnoli.
Commentaries here:
"The Enthymeme is a (rhetorical) syllogism". Aristotle, Reth. II, 22
"Rhetoric may be defined as the faculty of discovering the possible means of persuasion." Aristotle, Reth. I.2.1
Borges: I have never thought of that, but I suppose you’re right, Sir. I suppose you — yes, yes, I think you’re right. Because as — I don’t know who said that, was it Bernard Shaw? — he said, arguments convince nobody. No, Emerson. He said, arguments convince nobody. And I suppose he was right, even if you think of proofs for the existence of God, for example — no? In that case, if arguments convince nobody, a man may be convinced by parables or fables or what? Or fictions. Those are far more convincing than the syllogism — and they are, I suppose. Well, of course, when I think of something in terms of Jesus Christ. As far as I remember, he never used arguments; he used style, he used certain metaphors. It’s very strange — yes, and he always used very striking sentences. He would not say, I don’t come to bring peace but war — “I do not come to bring peace but a sword.” The Christ, he thought in parables. Well, according to — I think that it was Blake who said that a man should be — I mean, if he is a Christian — should be not only just but he should be intelligent ... he should also be an artist, since Christ had been teaching art through his own way of preaching, because every one of the sentences of Christ, if not every single utterance of Christ, has a literary value, and may be thought of as a metaphor or as a parable.and in a Conference at Harvard Borges observed:
"Had the poet said so in so many words, he would have been far less effective. Because, as I understand it, anything suggested is far more effective than anything laid down. Perhaps the human mind has a tendency to deny a statement. Remember what Emerson said: arguments convince nobody. They convince nobody because they are presented as arguments"Postscript:
"the power lay in the man, not in the dialectic."
"if one prevailed, it was because he possessed the stronger will, not because of dialectical games. As you see, I have not forgotten my Schopenhauer."
"Words, words, words. Shakespeare, the unparalleled master of words, held them in contempt."References.
Ancient rhetoricians made a functional distinction between trope (like metaphor, a textural effect) and scheme (like allegory, a structural principle). To the former category belong such figures as metaphor, simile (a comparison announced by "like" or "as"), personification (attributing human qualities to a nonhuman being or object), irony (a discrepancy between a speaker's literal statement and his attitude or intent), hyperbole (overstatement or exaggeration) or understatement, and metonymy (substituting one word for another which it suggests or to which it is in some way related--as part to whole, sometimes known as synecdoche).
To the latter category (scheme) belonged such figures as allegory, parallelism (constructing sentences or phrases that resemble one another syntactically), antithesis (combining opposites into one statement--"To be or not to be, that is the question"), congeries (an accumulation of statements or phrases that say essentially the same thing), apostrophe (a turning from one's immediate audience to address another, who may be present only in the imagination), enthymeme (a loosely syllogistic form of reasoning in which the speaker assumes that any missing premises will be supplied by the audience), interrogatio (the "rhetorical" question, which is posed for argumentative effect and requires no answer), and gradatio (a progressive advance from one statement to another until a climax is achieved).
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| The Platonic solids: tetrahedron, cube, octahedron, dodecahedron, icosahedron. |
| Figure | Tetrahedron | Cube | Octahedron | Dodecahedron | Icosahedron |
|---|---|---|---|---|---|
| Based on: | Triangle (3) | Square (4) | 3 | Pentagon (5) | 3 |
| Coinciding lines (Assn. rule) | 3 | 3 | 4 | 3 | 5 |
| Faces | 4 | 6 | 8 | 12 | 20 |
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| Carlyle |
Language is called the Garment of Thought: however, it should rather be, Language is the Flesh-Garment, the Body, of Thought. I said that Imagination wove this Flesh-Garment; and does not she? Metaphors are her stuff: examine Language; what, if you expect some few primitive elements (of natural sound), what is it all but Metaphors, recognized as such, or no longer recognized; still fluid and florid, or now solid-grown and colorless? If those same primitive elements are the osseous fixtures in the Flesh-Garment, Language, — then are Metaphors its muscles and tissues and living integuments
Carlyle contributes this metaphor, that Language is a body whose muscles are metaphors. This caught my attention because of my interest in metaphors, and of language-whose mastery is central to reasoning. This quote reminded me of Leibniz, who thought that it should be possible to find a small set of elementary concepts from which all known and new concepts could be derived; the idea of an alphabet of human thoughts (Alphabeto Cogitationum Humanarum), an irreducible system of notions, that cannot be further clarified. Now, Logic consists in concatenating those simple notions of language into more complex constructions, either inductively (heuristically - ars inveniendi) or deductively (ars demostrandi). Descartes seems to concur with this idea, because he points that the origin of some of our concepts are basically metaphorically structured: 
To think is to forget differences, to generalize and to abstract.Borges not only ventured into philosophy (Egginton & Johnson, 2009), but also foretold modern research (Kreiman, 2011; Quian Quiroga, 2012). The above gives a nice summary of what abstraction, and generalization is. I'm interested in defining it, and for that I'm actively collecting all references that come across me. Generalization and abstraction, although related, aren't identical. Both nevertheless are related to the induction problem in that they imply leaps from the particular to the general.
Locke adds:...the qualities or modes of things do never really exist ... apart by itself, and separated from all others, but are mixed, as it were, and blended together, several in the same object. But the mind [is] able to consider each quality singly or abstracted from those other qualities with which it is united, [and] does by that means frame to itself abstract ideas. Again, the mind having observed that in the particular extensions perceived by sense there is something common and alike in all, and some other things peculiar, as this or that figure or magnitude, which distinguish them one from another; it considers apart or singles out by itself that which is common... So likewise the mind, by leaving out of the particular ... perceived by sense that which distinguishes them one from another, and retaining that only which is common to all.
Hume elaborates on the relation of ideas:Since all things that exist are only particulars, how come we by general terms?... Words become general by being made the signs of general ideas. (EUH, IV, iii,6)
The very nature and essence of relation is to connect our ideas with each other, and upon the appearance of one, to facilitate the transition to its correlative. The passage betwixt related ideas is, therefore, so smooth and easy... (Treatise 1.4.2.34)One of the ones I like most is the one provided by Prof. Paul Humphreys (UVa):
The term ‘abstraction’ has been used in a variety of senses...covered by a process that we can call property elimination, which takes us from whatever total collection of properties (‘Properties’ here includes relations) is possessed by an entity to a proper subcollection of those properties, those properties being left unchanged (Except, of course, for the relation of the remaining properties to the now absent ones). Abstraction thus requires properties to be modular in the sense that the remaining properties are invariant when any given property is eliminated. Extending Ourselves, 141