Thursday, September 11, 2014
Consistency, Validity, and Truth, Within Reason
Let's build a framework for our burgeoning discussion of reason as a way of knowing. We'll talk next week about whether we see reason and logic as the same things. In the mean time let's learn some logic. First, work through this logic tutorial
on consistency and validity. Once on the site, follow the Tutorials
link, then select Tutorial One. Continue until you finish Exercise
1.4. Next, please tackle these logic puzzles.
Work patiently and with a pencil, reasoning out the consequences of
each statement and, where appropriate, its speaker. For your post, please write one statement that is valid and one statement that is consistent. In class on Monday, please be ready to explain why your statements are valid and consistent, respectively. Share your writing as a comment on this post. This is due Sunday before 9:30 pm.
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One valid statement: Mckim is in this TOK class. All the students in this TOK class are juniors, therefore Mckim must be a junior.
ReplyDeleteOne consistent statement: We have A period first on Monday, and F period last on Monday.
Valid statement: In order to be powered on, all televisions must be plugged in to an electrical outlet. The TV is on, therefore the television is plugged in.
ReplyDeleteConsistent statement: I am going to eat dinner at school tonight. I will not be eating dinner at home tonight.
Valid Statement: Spot is a dog. All dogs meow. Therefore Spot meows
ReplyDeleteConsistent statement: I like to sleep. I spend all of my free time sleeping
Valid Statement: Marcel is a snail. A snails have shells, therefore Marcel has a shell.
ReplyDeleteConsistent Statement: John is a father. John has three sons.
Valid Statement: Joanie rides horses. All riders like horses, therefore Joanie likes horse.
ReplyDeleteConsistent Statement: Marcie has a cousin. Her father's brother has a daughter.
Valid Statement: The ocean is blue. The kite is the color of the ocean, therefore the kite is blue.
ReplyDeleteConsistent Statement: I have study hall in the evening. I have hall meeting right after study hall.
Valid Statement: Bob has never been to Europe. Italy is a country in Europe. Therefore, Bob has never been to Italy.
ReplyDeleteConsistent Statement: Bob likes food. Bob eats food everyday.
Valid Statement: Everyone is SBS likes ice-cream. Amy is studying in SBS. So Amy likes ice-cream.
ReplyDeleteConsistent Statement: My mother has two children. I have only one brother.
Valid Statement: Natalie played Mark in Stoneleigh-Burnham's production of Rent. All actors of Stoneleigh-Burnham's production of Rent attend Stoneleigh-Burnham. Therefore, Natalie must attend Stoneleigh-Burnham
ReplyDeleteConsistent Statement: Betty has a very strong dislike for running. She will not be joining Cross Country this fall.
Valid Statement: Nolka lives in Shelburne Falls. Shelburne Falls is in New England, therefore Nolka lives in New England.
ReplyDeleteConsistent Statement: Erin is a SBS student. Erin is also female.
Valid statement: Yesterday was before today. Today is in between yesterday and tomorrow. Therefore, tomorrow comes after today.
ReplyDeleteConsistent statement: A comes before B in the English alphabet, so B must follow A.
Valid: I am 16. All 16 year olds have red hair. Therefore, I have red hair.
ReplyDeleteConsistent: The cat likes to eat. The cat likes to sleep.
Valid Statement: Grass is green. I have a grassy lawn in front of my house. Therefore, the lawn is green.
ReplyDeleteConsistent Statement: My sister plays the violin. I play the piano.