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Comment author: Hendrik_Boom 15 December 2008 03:24:00AM 0 points [-]

You might be interested in the last section of Motion Mountain, the free online physics textbook. It presents absolute limits for various measures of the universe, derived from quantum mechanics and general relativity. It appears that we live in a finite universe, though all of this stuff is pretty speculative.

Comment author: Hendrik_Boom 04 May 2008 06:07:05AM 1 point [-]

circular sunglasses that have two polarized disks

(1) Circular sunglasses sem to be out of fashion at the moment.

(2) the polarization of sunglasses is chosen to eliminate glare from reflections of a rain-soaked street.

Comment author: Hendrik_Boom 13 April 2008 12:43:33PM 5 points [-]

"Once upon a time, the notion of the scientific method - updating beliefs based on experimental evidence - was a philosophical notion."

"But back in Galileo's era, it was solely vague verbal arguments that said you should try to produce numerical predictions of experimental results, rather than consulting the Bible or Aristotle."

As far as I know, the first hints of the scientific method (testing theories by experiment) appear in the writings of Roger Bacon (who liven a few hundred years before the Francis Bacon people seem to confuse him with). He argued that when interpreting Aristotle, instead of arguing what the modern translation of an obscure Greek word was, you should use experiments to try out the alternative meanings. Experiment was conceived as a method of consulting Aristotle.

Humble beginnings.

In response to Joint Configurations
Comment author: Hendrik_Boom 13 April 2008 12:26:27PM 0 points [-]

Grey Area asked, "For instance, Cox's theorem states that plausibility is a real number. Why should it be a real number?" For that matter, why should the plausibility of the negation of a statement depend only on the plausibility of the statement? Mightn't the statement itself be relevant?

Comment author: Hendrik_Boom 10 April 2008 02:49:02PM 1 point [-]

Any complex number? I.e. you're invoking an uncountable infinity for explaining the lowest known layer of physics? How does that fit in with being an infinite-set atheist - assuming you still hold that position?

In case you didn't notice, he's talking about a complex number, not all the complex numbers.

Comment author: Hendrik_Boom 18 March 2008 02:35:54PM 4 points [-]

There's a long story at the then of The Mind's Eye (or is it The Mind's I? in which someone asks a question:

"What colour is this book.?"

"I believe it's red."

"Wrong"

There follows a wonderfully convoluted dialogue. The point seems to be that someone who believes the book is red would say "It's red," rather than "I believe it's red."

In response to Fake Reductionism
Comment author: Hendrik_Boom 18 March 2008 02:24:46PM 2 points [-]

I'm in the middle of reading a wonderful fantasy. It's John Crowley's four-volume series Aegypt (not to be confused with his one-volume book Aegypt published a decade or two ago.) It is about a man who discovers that (here's the fantasy) there is more than one history of the world. Only a few hundred years ago, the Earth was at the centre of the universe. It was when people started to realise this wasn't so that the universe changed. Before that, the Earth was at the centre of the universe, and always had been so. After that the Earth wasn't at the centre, and had never been there.

This book excites my sense of wonder, even though I know it isn't so.

I'm also reading articles on how category theory is applied to quantum mechanics, and how this brings with it a whole set of nonclassical logics -- logics in which proof by contradiction fail, and in which 'and' and 'or' don't distribute (which I believe plays havoc with Bayes' theorem). Fascinating stuff.

In the sixties I was drunk on Cantor's theories of transfinite numbers, just intoxicated with an appreciation of their sheer, unimaginable hugeness. Don't tell me that mathematics is dry, and there is no sense of wonder there.

In the seventies I became a constructivist. Gone were all those transfinite objects. But the sense of wonder remains, and I keep finding new things to amaze me -- the sheer intricate details of finite things, and of merely countable infinity. The boundary between finite representations of the infinite and the infinite things represented is wonderfully intricate in detail.

The sense of wonder is innate. It attaches itself to things that exist and things that don't. There's no need to give it up merely because you've felt the divine in things that are unreal. It's still there, even if the things aren't. It's still there, even if the things are.

But is it important to distinguish what is real and what is not.

Comment author: Hendrik_Boom 18 March 2008 01:43:43PM 0 points [-]

Eliezer could assert that the technology to beat the CAPTCHAs exists and is understood

Id does. In fact, most of the commonly used CAPTCHAs can be more reliably decoded by a machine than by a human being.

-- hendrik

Comment author: Hendrik_Boom 11 March 2008 01:38:21AM 17 points [-]

It's not about what the bug-eyed monster considers sexy. It's about what the human reader considers sexy.

Comment author: Hendrik_Boom 02 March 2008 02:24:18PM 6 points [-]

other people were near-perfect "eidetic" imagers

I read a report in the Scientific American a few years ago in which they were doing experiments with rend0m-dot stereograms -- the kind of thing where if you just look at one image or the other you just see random dots, but if you look at one with one eye and the other with the other eye you see a square full of random dots floating above a background with random dots.

Some people could be shown one image one week, and the other the next week, each by itself, and suddenly get it. Evidently they had remembered the entire first-week image in memory to scompare with the second a week later.

I was impressed. This seemed eidetic enough for me.

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