Ian,

I am replying to my own thread, because I realized it was incomplete.

In writing class (which you clearly do not need)we learned "show do not tell". This essay was showing, not telling. Is the idea of something the thing itself? Is the name of an idea the idea? Is an equation of the universe, the universe (at this point I clearly went beyond the text)? You let us make these decisions, which I do not know if I like or hate you for putting us in such a position.

All the best,

Jeff

Dear Ian,

Thank you for going to my essay. I expect that my essay will not be red as a tree but as a surface with punctures, it is non local in some sense. I also hope a big picture is emerging, some points are ongoing research (as those pointed out in the abstract), some technical aspects may not be familiar to quantum physicists (e.g. modular forms and characters).

If you go to reference [17] just appearing in QIP, you can see that I cite a work of yours on the "order theoretic quantification of contextuality", meanwhile I also found another measure of geometrical contextuality that I am currently working on. A mathematician would say the Langlands program but I stay closer to physics.

Best,

Michel

    Dear Ian,

    Thanks for the very enjoyable essay. The distinction between representation and tangible realities is well articulated. One of the oddities of this dichotomy seems to be that some physical systems can characterize what may (or may not) be tangible using representation. So it seems these two modes of description are not entirely independent but that the representational influences the tangible and the tangible constrains what can be represented. You seem to suggest a starker line between the two, so I am curious on your thoughts where these two domains interact. In particular, my view is that addressing this aspect is essential to addressing why math seems to work for describing physical reality.

    Best,

    Sara

      Dear Ian,

      very nice essay. I still need to read it in full detail to appreciate all the sides of the conversation. For the moment let me say that I appreciate the choice of Lewis Carrol, which, btw, raised the famous logical paradox that proves that even the "modus ponens" must be formalized. If logic itself must be formalized, than you would agree with me that Physics must be formalized, otherwise would not be logical, whence not logical falsifiable, whence not scientific. As you know, this is the point raised in my essay.

      Hope to see you soon, and enjoy a thorough conversation about this crucial point about physical science.

      My best regards

      Mauro

        Hi Sara,

        Thanks for the comments. I think you raise a very important issue: where *is* the line between tangible and representational reality? Is the line, if it exists, well-defined or fuzzy? And if we err on the side of caution, should we err on the tangible side or the representational side?

        I'm torn on this issue, to be honest. I'm not a pure operationalist, but I'm not even sure operationalism, at least as it is practiced today, is even purely tangible. I do firmly believe that physics should be about the physical, but I also believe that well-founded theories are as broad as possible in their explanatory nature. So, to give you an example, if you've ever watched Susskind's videos on what you need to know about modern physics, he starts out talking about Newton's laws. Whenever I teach introductory material, I start with energy and momentum because Newton's laws are easily derived from conservation of momentum and energy. When I made this point to a friend of mine, he argued that introducing Newton's laws (and general laws of motion) first, made more sense from an operationalist view. So, in that sense, I am not an operationalist.

        On the other hand, as I said, I do think we need to default to physical reality. Feynman said something about this once. In fact Carl Caves said something to me once many years ago to this effect: we're physicists and we're doing physics so we should default on the side of physics.

        So, in short, I unfortunately don't have a neat and clean answer to your question. I think the line I painted in the essay is quite stark for that particular example. It may be that there is a stark line in *every* example, but that there is no single, unifying way of defining that line such that we can "know" it in a given case (if that makes any sense).

        Cheers,

        Ian

        Hi Mauro!

        Part of me completely agrees with you that physics needs to be formalized if it is built on logic (which it partially is). But another part of me says that it is ultimately built on what we can measure (see my reply to Sara above). In other words, it still has to explain what we see in a lab. It's not clear that we can formalize everything we see. Certainly people have tried ever since Hilbert's original proposal (and, to some extent, Newton and others in the 17th century tried as well, before physics took a more experimental turn). It seems telling to me that no one has fully succeeded in this endeavor yet, though of course that doesn't mean it can't be done.

        Hope to see you soon! Let me know if you will be in Boston at some point.

        Cheers,

        Ian

        Hi Michel,

        Thank you for citing that work! I look forward to hearing about your additional measure of geometrical contextuality when it is finished.

        Indeed, I am not all that familiar with modular forms and characters. But that is one of the beautiful points of your essay. It introduces some really terrific ideas to the physics community.

        Cheers,

        Ian

        11 days later

        Hi Ian

        I really enjoyed your essay!

        It was very brave as such a dialogue is extremely challenging. You have to maintain a direction to the conversation leading the reader to thoughts without explicitly stating them, and all the while make the conversation lively, engaging and natural. Its a daunting challenge, and I think that you did a great job!

        I enjoyed how the dialogue began and ended with the two attempting to shove the Doormouse into the teacup.

        I wonder, did the Doormouse actually count to infinity in the same way that Achilles caught up to and passed the Tortoise?

        Cheers

        Kevin

        a month later

        Congratulations on your prize. Yours is the most memorable of the essays I read and deserves recognition among the winners. Well done, kind regards Georgina

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