You guys are making possible sources of confusion between the map and the territory sound like they're specific to QFT while they actually aren't. “Oh, I know what a ball is. It's an object where all the points on the surface are at the same distance from the centre.” “How can there be such a thing? The positions of atoms on the surface would fluctuate due to thermal motion. Then what is it, exactly, that you play billiards with?” (Can you find another example of this in a different recent LW thread?)
Your ball point is very different. My driving point is that there isn't even a nice, platonic-ideal type definition of particle IN THE MAP, let alone something that connects to the territory. I understand how my above post may lead you to misunderstand what I was trying to get it..
To rephrase my above comment, I might say: some of the features a MAP of a particle needs is that its detectable in some way, and that it can be described in a non-relativistic limit by a Schroedinger equation. The standard QFT definitions for particle lack both these features. Its also not-fully consistent in the case of charged particles.
In QFT there is lots of confusion about how the map works, unlike classical mechanics.
A few notes about the site mechanics
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A list of some posts that are pretty awesome
I recommend the major sequences to everybody, but I realize how daunting they look at first. So for purposes of immediate gratification, the following posts are particularly interesting/illuminating/provocative and don't require any previous reading:
More suggestions are welcome! Or just check out the top-rated posts from the history of Less Wrong. Most posts at +50 or more are well worth your time.
Welcome to Less Wrong, and we look forward to hearing from you throughout the site!
Note from orthonormal: MBlume and other contributors wrote the original version of this welcome post, and I've edited it a fair bit. If there's anything I should add or update on this post (especially broken links), please send me a private message—I may not notice a comment on the post. Finally, once this gets past 500 comments, anyone is welcome to copy and edit this intro to start the next welcome thread.