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All the general propositions favouring freedom I had … imbibed at my father's knee or acquired by candle-end reading of Burke and Hayek ..".
--
Margaret Thatcher, in The Path to Power (1995), p. 604

 

Friedrich Hayek

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Pure Mathematics is the class of all propositions of the form “p implies q,” where p and q are propositions containing one or more variables, the same in the two propositions, and neither p nor q contains any constants except logical constants. And logical constants are all notions definable in terms of the following: Implication, the relation of a term to a class of which it is a member, the notion of such that, the notion of relation, and such further notions as may be involved in the general notion of propositions of the above form. In addition to these, mathematics uses a notion which is not a constituent of the propositions which it considers, namely the notion of truth.

 

Bertrand Russell

 

For want of the apparatus of propositional functions, many logicians have been driven to the conclusion that there are unreal objects. It is argued, e.g., by Meinong, that we can speak about "the golden mountain," "the round square," and so on; we can make true propositions of which these are the subjects; hence they must have some kind of logical being, since otherwise the propositions in which they occur would be meaningless. In such theories, it seems to me, there is a failure of that feeling for reality which ought to be preserved even in the most abstract studies. Logic, I should maintain, must no more admit a unicorn than zoology can; for logic is concerned with the real world just as truly as zoology, though with its more abstract and general features.

 

Bertrand Russell

 

I must say that I have been deeply gratified by reading a book [Hayek's "The Sensory Order"] of which I had not been aware when I wrote my little essay on group selection theory … I was deeply impressed … I recommend this book to your attention [i.e. The American Academy of Arts and Sciences], as an exercise in profound thinking by a man who simply considers knowledge for its own sake. What impressed me most is his understanding that the key to the problem of perception is to comprehend the nature of classification. Taxonomists have struggled with this problem many times, but I think von Hayek considered this problem in a broader sense.

 

Friedrich Hayek

 

For Dicey, writing in 1885, and for me reading him some seventy years later, the rule of law still had a very English, or at least Anglo-Saxon, feel to it. It was later, through Hayek's masterpieces "The Constitution of Liberty" and "Law, Legislation and Liberty" that I really came to think this principle as having wider application.

 

Friedrich Hayek

 

Many years ago I used to read books like, for example, Ernest Thompson Seton's "Lives of Game Animals" to learn about animal behavior. But after a certain point, after living in the woods for a while, I developed an aversion to reading any scientific accounts. In some sense reading what the professional biologists said about wildlife ruined or contaminated it for me. What began to matter to me was the knowledge I acquired about wildlife through personal experience.

 

Theodore Kaczynski