Item 1

“ Rằng tôi chút phận đàn bà

Ghen tuông thì cũng  người ta thường tình”

(Truyện Kiều- Nguyễn Du)


Tôi là phận đàn bà

Đàn bà thường ghen


Tôi ghen là thường tình

→ the argument is valid but no sound because inference is true but premise 2 is not certainly true.

Item 2

Sherlock Holmes Camping Joke

Sherlock Holmes and Dr Watson went on a camping   trip.  After a good meal and a bottle of red, they lay down for the   night and went to sleep. 

Some hours later Holmes woke up, nudged his faithful   friend and said, “Watson, I want you to look up at the sky and tell me   what you see.”  Watson said, “I see millions and millions of   stars.”  Sherlock said, “And what does that tell you?”


After a minute or so of pondering Watson said,   “Astronomically, it tells me that there are millions of galaxies and   potentially billions of planets.  Astrologically, I observe that Saturn   is in Leo.  Horologically, I deduce that the time is approximately a   quarter past three in the morning.  Theologically, I can see that God is   all powerful and that we are small and insignificant.  Meteorologically,   I suspect that we will have a beautiful day today.  What does it tell   you?” 

Holmes was silent for about 30 seconds and said,   “Watson, you idiot!  Someone has stolen our tent!”



They are in the bed and look up at the sky

The bed is in the tent

They see millions and millions of stars


The tent is stolen

→ The argument   is deductive reasoning.

Item 3


If women use pond (A) their skin will be more beautiful   (B).

If they do not use pond their skin will not be   beautiful.

The women’s skin may be beautiful by other ways   or using other products.

structural fallacy: denying the   antecedent

     If A then B

     Not A


     Therefore, not B

 content fallacy: deductively invalid and relevant weak argument


One response »

  1. phithihong says:

    Hi, Le. Your entry is really carefully analyzed. It’s quite good but i still want you to reconsider item 1. As you say, the premise 2 is not certailny true. In my opinion, “Đàn bà thường ghen” is true. The author did emphasize that Women are “usually” jealous, not “always”. In other words, most of women, not all women are jealous. Anyway, it’s just myself idea. i hope your entry will be better with my comment. Good luck to you!

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