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Preview: Comments on: Rhetoric, part 2–Tropes and Schemes (99)

Comments on: Rhetoric, part 2–Tropes and Schemes (99)



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By: Michael Buchko Jr.

Sat, 17 May 2008 05:45:14 +0000

I thought I'd point out, in case you didn't know...but Abraham Lincoln was a racist. Well, technically, he was neutral, but less in favor of black freedom than anything. This quote came from his own mouth in a debate with Douglas McArthur ( I think that was his name... former black slave): "I will say then that I am not, nor ever have been in favor of bringing about in any way the social and political equality of the white and black races-that I am not nor ever have been in favor of making voters or jurors of Negroes, nor of qualifying them to hold office, nor to intermarry with white people; and I will say in addition to this that there is a physical difference between the white and black races which I believe will forever forbid the 2 races living together on terms of social or political equality. And inasmuch as they cannot so live, while they do remain together there must be the position of superior and inferior, and I as much as any other man am in favor of having the superior position assigned to the white race." Also, he said something along the lines of, "If I could have ended the war and unified the country without freeing the black race, I would have done it." He also said that of all possible solutions, but he still said that, and it is worth noting. I would have loved to provide sources, but the only real links I could find were .com's, and as you probably know, those are terrible sources. But I'm sure you can Google "Abraham Lincoln and Racism" or something along those lines. And finally, I saw this book on Amazon, called Thank You for Arguing: What Aristotle, Lincoln, and Homer Simpson Can Teach Us About the Art of Persuasion and I thought it was interesting because you mentioned Homer Simpson in a comment reply above. I would love to learn language and rhetoric from Homer Simpson. And the book The Rhetoric of RHETORIC: The Quest for Effective Communication jumped out at me, because it seems a little Oxymoronic to me. As always, keep on rocking on!



By: Julie

Mon, 10 Mar 2008 23:13:58 +0000

Goose King has detailed this very nicely. And he's actually absolutely right about the universal instantiation. I was trying to say that in a more general way when I said B needs to always be true if A is true. :-) I admit to having simplified. :-\



By: The Goose King

Mon, 10 Mar 2008 09:02:55 +0000

Sorry to disagree, but I'm not so sure that's correct. A statement of the form:- A implies B B implies C Therefore A implies C ...is indeed a syllogism, but it doesn't apply to the Socrates example, and doesn't have anything to do with modus ponens. It is in fact a hypothetical syllogism, whereas the Socrates example is a categorical syllogism, or more specifically a universal syllogism (there is also something called a disjunctive syllogism, but I won't go into that). The universal syllogism (or any categorical syllogism) often isn't considered a discrete law in modern logic because it is in fact a combination of two existing rules (and therefore requires an intermediate step): the rule of universal instantiation (that is: what is true of every individual thing must be true of any one thing) and modus ponendo ponens (more commonly just called modus ponens), which says:- A implies B A Therefore B The full universal syllogism, therefore, would look like:- For-all x in set S (A(x) implies B(x)) Therefore A(c) implies B(c) when c is an element of S A(c) implies B(c) A(c) Therefore B(c) Or in the Socrates example:- (Begin universal instantiation) For all things, if that thing is a man, then that thing is mortal Therefore if Socrates is a man, then Socrates is mortal (Begin modus ponens) If Socrates is a man, then Socrates is mortal Socrates is a man Therefore Socrates is mortal. Because we are used to categorical syllogisms, we tend to take "If Socrates is a man, then Socrates is mortal" as implicit, but in modern logic, which tends to be concerned with what computers can understand, it's not admissible to skip a step like that, and "If Socrates is a man, then Socrates is mortal" is what's known as a 'lemma': a minor conclusion that needs to be proven (even if only in one step in this case) in order to reach the major conclusion. To get to the point, the reason that you can't say:- For all things, if that thing is a man then that thing is mortal Socrates is mortal Therefore Socrates is a man ...is simply because the implication operator in the first premise is a one-way relationship (the implication operator is thus said to be 'non-commutative': it has an 'antecedent' and a 'consequent' which are not interchangeable). "A implies B" just says that if A is true, B is true (and, as a result, that if B is false, A is false). It doesn't say what happens when B is true (A might be true or false), or when A is false (B might be true or false). It should also be noted that the implication operator says only this: it doesn't say anything about causality. B might be caused by A ("If I have a haircut, then my hair will be short.") or A might be caused by B ("If I have less money today than yesterday, then I have paid for something.") or neither ("If I go outside, then I will go to my Logic class": going outside is necessary for going to class, but is not the cause of it). Sorry if this overly long post just confused the issue...



By: Dave

Sat, 08 Mar 2008 18:55:10 +0000

All right! My friend Julie has almost literally drawn me a picture, for which I am very grateful! Your penultimate sentence is the key to my understanding. If you say A implies C, then you've skipped a step. Thanks, Julie!



By: Julie

Sat, 08 Mar 2008 18:55:09 +0000

Sorry. I just realized I made two typos. fourth paragraph should be the trick is that you need to keep order and B needs to always be true if A is true, as well as C needs to be always true when B is true. And further down I should add that then Socrates is mortal. is (A implies B) It works in mathematics, and other logic as well as rhetoric, and is the basis for rule chaining in Expert Systems.



By: Julie

Sat, 08 Mar 2008 18:52:13 +0000

Fortunately logic IS my strong suit - I make my living on this particular area of logic. In the logic world, the rule is called Modus Ponens, and it works out to If A implies B and B implies C, then A implies C the trick is that you need to keep order and B needs to always be true if A is true, as well as C needs to be always true when A is true. The Socrates example is If all men are mortal (note this is B implies C) and Socrates is a man (this is A implies B) then Socrates is mortal. If your second proposition is Socrates is mortal, you have A implies C, and you cannot infer that A implies B - you don't have the logical chain. I knew that Masters in AI would come in handy some day.



By: Anne Frid de Vries

Sat, 08 Mar 2008 07:25:58 +0000

I am a bit confused. Weren't you expecting this to be a two part series? Now it is going to the three, but I decided to review it already - I couldn't wait. http://anneisaman.blogspot.com/2008/03/rethorics-series-by-word-nerds.html A



By: Howard Shepherd

Mon, 03 Mar 2008 23:36:54 +0000

As Homer Simpson would say: "Doh!" Tyler is absolutely right. This was an example of my being overly fastidious; I mixed up the two speeches of Brutus and Marc Antony. Brutus's speech begin with "Be patient till the last." He then goes on to give a speech as logically compelling and as rhetorically flat as a Jimmy Carter speech on energy conservation. It is Marc Antony who is the successful rhetorician--in the negative sense of the term. Throughout his speech, Antony repeats the refrain "Brutus is an honorable man"==but each time, he juxtaposes it with a counter-example of Julius Caesar's life that makes the phrase more and more bitterly ironic. At the end, he has whipped the Roman rabble into a frenzy. Thanks, Tyler, for setting me straight.



By: Tyler

Mon, 03 Mar 2008 21:34:45 +0000

Howard, when discussing the quote "Friends, Romans, Countrymen, lend me your ears" from Shakespeare's "Julius Caesar," mis-attributes the line. The funeral oration is given by Marc Antony, not Brutus.