Syllogism Completion Exercise

The following are examples of syllogistic arguments that are missing the conclusion. Study the two reasons very carefully and complete the syllogism with the conclusion that logically follows. 1. All mammals are warm-blooded animals. All whales are mammals. Therefore 2. All flowers are pretty objects. All pansies are flowers. Therefore

Bertrand Russell -- On Denoting

Explain what Bertrand Russell means by this theory of denoting, which is that denoting phrases never have any meaning in isolation, although they contribute to the meaning of every sentence in which they occur.

logic

I would like to have these two questions answered for my own research in philosophy, if possible. 1) Is every satisfiable formula derivable? Why? 2) Is every valid formula derivable? Why?

Valid Or Invalid

Five identical sweatshirts are placed in a bag. A letter is stiched to the back of each shirt; two of the letters are L's and three are W's. Chris, Hugo and Mary each pull out a sweatshirt without looking at it and put it on. Chris can see Mary's and Hugo's and correctly deduces, "I cannot tell which letter I have on." Mary's only see's Hugo's shirt and draws the same valid conclusion. Hugo sees no-ones shirt but uses his logic and is able to tell which letter is on his back. How does Hugo do it? Write a valid arguement that involves Chris's deduction. Then using that conclusion write a second arguement to justify Hugo's claim. Using Venn diagrams show your argument.

Putting arguments into standard form

I can understand the basic standard form of an argument when it is given to me, but when I see an argument without a second premis I dont understand it. My teacher is not very good at explaining and will not even recommend a good book for me to read to help understand. This is my last hope to understand these examples before the test tommorow, so if someone can please help. For example I was given the following questions as a study guide: A. Women live longer than men, on the average. So, you will probably live longer than your husband! This is what I think: P1: Women Live longer than men P2: Women live longer than men on average, so you will probably live longer than your hus... click for more