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Lewis Carroll Logic Puzzles

LizPendens™

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Lewis Carroll Logic Puzzles
« on: November 24, 2006, 10:13:21 PM »
since some of you are burned out on lsat logic but still want to have some fun, try the following syllogisms created by the victorian-era oxford logic and mathematics scholar, the rev.charles dodgson, also known as alice in wonderland author lewis carroll.



Once master the machinery of Symbolic Logic, and you have a mental occupation always at hand, of absorbing interest, and one that will be of real use to you in any subject you may take up. It will give you clearness of thought - the ability to see your way through a puzzle - the habit of arranging your ideas in an orderly and get-at-able form - and, more valuable than all, the power to detect fallacies, and to tear to pieces the flimsy illogical arguments, which you will so continually encounter in books, in newspapers, in speeches, and even in sermons, and which so easily delude those who have never taken the trouble to master this fascinating Art.


                     - Lewis Carroll



the following syllogisms or logic puzzles were meant to be nonsensical. Dodgson felt that readers might read too much into recognizable connections. as you would with an LR stimulus, break them down into formal logic componants and their contrapositives: A --> B, etc.


i'll post three now. if you like them i'll post some more of increasing difficulty.

1)

(a)  All babies are illogical.
(b)  Nobody is despised who can manage a crocodile.
(c)  Illogical persons are dispised.
(d)  ?

2)

(a) My saucepans are the only things that I have that are made of tin;
(b) I find all your presents very useful;
(c) None of my saucepans are of the slightest use.
(d) ?


3)

(a) None of the unnoticed things, met with at sea, are mermaids.
(b) Things entered in the log, as met with at sea, are sure to be worth remembering.
(c) I have never met with anything worth remembering, when on a voyage.
(d) Things met with at sea, that are noticed, are sure to be recorded in the log. 
(e) ?



YoCallMeD

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Re: Lewis Carroll Logic Puzzles
« Reply #1 on: November 24, 2006, 10:25:19 PM »
that is so freakin' cool

links, please!

i have a feeling i could crack out on these ala sudoku

LizPendens™

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Re: Lewis Carroll Logic Puzzles
« Reply #2 on: November 24, 2006, 10:33:59 PM »
that is so freakin' cool

links, please!

i have a feeling i could crack out on these ala sudoku


the dude published entire books of these and other mathy and logicky kinds of things. ::shudder::


http://www.amazon.com/s/102-1286021-3604966?ie=UTF8&tag=mozilla-20&index=blended&link%5Fcode=qs&field-keywords=lewis%20carroll%20logic&sourceid=Mozilla-search

YoCallMeD

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Re: Lewis Carroll Logic Puzzles
« Reply #3 on: November 24, 2006, 10:39:11 PM »
lol, first place i looked after the initial post

thanks, though

LizPendens™

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Re: Lewis Carroll Logic Puzzles
« Reply #4 on: November 24, 2006, 10:47:04 PM »
here's the same thing but prettily illustrated:

http://www.math.hawaii.edu/~hile/math100/logice.htm

and some links:

http://www.lewiscarroll.org/logic.html

LizPendens™

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Re: Lewis Carroll Logic Puzzles
« Reply #5 on: November 24, 2006, 10:50:14 PM »


that stuff is fun, and LSAT like, as long as I only pay attention to the nouns and the verbs.  Mostly the verbs, I like to call the nouns things like X, Y and Z



that was his point, in his jabberwocky way, of using nonsense nouns, forcing lazy thinkers like me to break them down into abstracts.


i'm a big lewis carroll fan, if you couldn't already tell.

LizPendens™

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Re: Lewis Carroll Logic Puzzles
« Reply #6 on: November 24, 2006, 10:56:55 PM »


Quote
Lewis Carroll may have exaggerated a little, as math professors often do about the utility of their subject.

this is as false as false can be!


where did that quote come from?

LizPendens™

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Re: Lewis Carroll Logic Puzzles
« Reply #7 on: November 24, 2006, 11:02:02 PM »
i love this:

According to the
Mock Turtle, the
four branches of
arithmetic are
(1) Ambition
(2) Distraction
(3) Uglification
(4) Derision.



as a math-phobe, i'm taking it as my personal motto.

LizPendens™

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Re: Lewis Carroll Logic Puzzles
« Reply #8 on: November 25, 2006, 12:00:01 AM »
following along the lewis carroll theme, here's his tips on How to Learn:


   1. Begin at the beginning, and do not allow yourself to gratify mere idle curiosity by dipping into the book, here and there. This would very likely lead to your throwing it aside, with the remark `This is much too hard for me!', and thus losing the chance of adding a very large item to your stock of mental delights . . .

   2. Don't begin any fresh Chapter, or Section, until you are certain that you thoroughly understand the whole book up to that point and that you have worked, correctly, most if not all of the examples which have been set . . . Otherwise, you will find your state of puzzlement get worse and worse as you proceed till you give up the whole thing in utter disgust.

   3. When you come to a passage you don't understand, read it again: if you still don't understand it, read it again: if you fail, even after three readings, very likely your brain is getting a little tired In that case, put the book away, and take to other occupations, and next day, when you come to it fresh, you will very likely find that it is quite easy.

   4. If possible, find some genial friend, who will read the book along with you, and will talk over the difficulties with you. Talking is a wonderful smoother-over of difficulties. When I come upon anything—in Logic or in any other hard subject—that entirely puzzles me, I find it a capital plan to talk it over, aloud, even when I am all alone. One can explain things so clearly to one's self! And then you know, one is so patient with one's self: one never gets irritated at one's own stupidity!





wise words. especially the admonishment to read it again and again and again until you understand it, and to try discussing tricky concepts with "some genial friend."