PhilosophyTutor comments on Welcome to Less Wrong! (2010-2011) - Less Wrong

42 Post author: orthonormal 12 August 2010 01:08AM

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Comment author: Ezekiel 26 November 2011 12:58:04AM 6 points [-]

Hi, everyone.

I'm currently finishing a first degree in CS, and I've been reading LW for a few months now (since June). I've read through most of the Sequences and check the front page of the site for anything that looks interesting whenever I want to put off doing something, which is usually several times a day. I also need to get round to finishing Godel, Escher, Bach some time (I'm kinda slow).

I am, at the moment, a terrible rationalist - my goals aren't even clearly defined, let alone acted on, and I have a strong background in tournament debating, which allows me to argue myself into believing whatever I feel like believing at any given moment. I think I'm getting better at that, but of course my own opinion is almost worthless as evidence on the subject.

On the other hand, reading this site (especially Yudkowsky's stuff) at least made me stop being religious. I like to think I'd have got there in the end anyway, but seeing as I really didn't enjoy it, I thank everyone here for pulling me out sooner rather than later.

Quick question: Does anyone know of a formal from-first-principles justification for Occam's Razor (assigning prior probabilities in inverse proportion to the length of the model in universal description language)? Because I can't find one, and frankly, if you can't prove something, it's probably not true. I'd rather not base my entire thought process on things that probably aren't true.

Hoping to be able to contribute, Ezekiel

PS Good grief, there's an average of one introducing-yourself post every couple of days! Why the heck are all the front-page articles written by the same handful of people?

Comment author: PhilosophyTutor 26 November 2011 05:42:14AM *  0 points [-]

Quick question: Does anyone know of a formal from-first-principles justification for Occam's Razor (assigning prior probabilities in inverse proportion to the length of the model in universal description language)? Because I can't find one, and frankly, if you can't prove something, it's probably not true. I'd rather not base my entire thought process on things that probably aren't true.

I suspect you will never find one. To get the scientific process off the ground you have to start with the linked assumptions "the universe is lawful" and "simpler explanations are preferable to more complex ones". Those are more like mathematical axioms than positions based on evidence.

The reason being, you can explain absolutely any observation with an unboundedly large set of theories if you are allowed to assume that the laws of the universe change or that complex explanations are kosher. The only way to squeeze the search space down to a manageable size is to check the simplest theories first.

Fortunately it turns out we live in a universe where this is a very fruitful strategy.

ETA: I'm relatively new here: Whoever downvoted this could you perhaps explain your thinking?

Comment author: [deleted] 26 November 2011 05:47:10AM 2 points [-]

Fortunately it turns out we live in a universe where this is a very fruitful strategy.

As I understand it, that is the justification.

Comment author: Ezekiel 26 November 2011 11:47:19AM 0 points [-]

Upvoted for pointing out that Yudkowsky already dealt with the issue. I'd forgotten. I'm still not completely happy, but I guess sometimes you do hit rock bottom...