Korean Food, Not-So-Bad-Logic-Test, and Harry Potter
What do the three items above have in common with each other? Nothing, other than the fact that they characterize my life over the last couple of weeks. Well, in the interest of being brief I will try to give you a taste of all three at once:
If studying is any indication of performance on the Logic Exam, then I would get 100%.
Studying is not any indication of performance on the logic exam.
Therefore I did not get 100%.
[Invalid, fallacy of denying the antecedent]
Either I spent my time studying or I spent my time reading the first three Harry Potter Books.
I did not spend my time studying, therefore I spent my time reading the first three Harry Potter Books.
[Valid, disjunctive syllogism]
All Koreans love to share their food.
Some of my friends are Korean.
Some of my friends love to share their food.
[Valid, categorical syllogism]
If my Korean friend sees I like a food, then she gives me more.
She sees that I like it.
She gives me more.
[Valid, Modus Ponens]
If I persist in writing in this style, then no reader will finish my blog.
Some readers have finished my blog.
Therefore I must not have persisted in writing in this style.
[Valid, Modus Tollens] [unfortanately for you this argument is valid, but not sound]
What do the three items above have in common with each other? Nothing, other than the fact that they characterize my life over the last couple of weeks. Well, in the interest of being brief I will try to give you a taste of all three at once:
If studying is any indication of performance on the Logic Exam, then I would get 100%.
Studying is not any indication of performance on the logic exam.
Therefore I did not get 100%.
[Invalid, fallacy of denying the antecedent]
Either I spent my time studying or I spent my time reading the first three Harry Potter Books.
I did not spend my time studying, therefore I spent my time reading the first three Harry Potter Books.
[Valid, disjunctive syllogism]
All Koreans love to share their food.
Some of my friends are Korean.
Some of my friends love to share their food.
[Valid, categorical syllogism]
If my Korean friend sees I like a food, then she gives me more.
She sees that I like it.
She gives me more.
[Valid, Modus Ponens]
If I persist in writing in this style, then no reader will finish my blog.
Some readers have finished my blog.
Therefore I must not have persisted in writing in this style.
[Valid, Modus Tollens] [unfortanately for you this argument is valid, but not sound]