recursive function theory, which was developed already in late nineteenth century by Koch, Hilbert, and others

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        Anyway, I became absorbed in the logic, in the mathematics, in the philosophy of the 
        Vienna Circle. And here you see again, the possibilities are wide open; they reach into 
        almost all sorts of thinking: how do we do it, how do we do things, how do we think about 
        it, how can we describe our descriptions, how can we think about our thinking? Thus, very 
        early in my life I was exposed to what I call today a second order notion -- the notion 
        that speaks about notion, which I believe is one of the crucial concepts of second order 
        cybernetics and reflexive thinking in general. A logic which is associated with reflexive 
        thinking or with a closed semantic system is a very different logic than the classical 
        one, and I think it contains insights which can be applicable practically to anything -- 
        whether you take education, or philosophy, or mathematics, or physics. Consider, for 
        instance, what today people call chaos theory -- of course, it is a wonderful, very 
        fascinating name, but it is recursive function theory, which was developed already in late 
        nineteenth century by Koch, Hilbert, and others. 
      
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