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Comment by arromdee on Open thread, Oct. 27 - Nov. 2, 2014 · 2014-10-30T18:47:49.567Z · LW · GW

Whenever there is some kind of a "league against monsters", it is probably a safe bet that there is a monster somewhere at the top. (I am sure there is a TV Tropes page or two about this.)

https://allthetropes.orain.org/wiki/Hired_to_Hunt_Yourself

Comment by arromdee on Fifty Shades of Self-Fulfilling Prophecy · 2014-07-26T01:00:33.745Z · LW · GW

I wrote what could best be described as a proto-rationalist Sailor Moon fanfic. Bear in mind that it's really old--I last worked on it around 2000 and it predates even HPMOR. It doesn't try to sell rationalism, but it has Sailor Moon do things that make sense. I never finished it but I got to the Doom Tree story. http://www.rahul.net/arromdee/fanfic.html

Comment by arromdee on Open thread, 9-15 June 2014 · 2014-06-15T01:19:33.538Z · LW · GW

They would not have pages about works that were primarily sexual, because the advertisers prohibited it.

Comment by arromdee on Open thread, 9-15 June 2014 · 2014-06-15T00:20:12.178Z · LW · GW

https://allthetropes.orain.org/wiki/Troper_Tales

The fork decided not to bring the troper tales back, for just that reason.

Comment by arromdee on Open thread, 9-15 June 2014 · 2014-06-14T09:31:00.010Z · LW · GW

It was suggested I post here, but there's a TV Tropes fork at https://allthetropes.orain.org/wiki . It uses mediawiki software and gets rid of the censorship at TV Tropes. (I suspect this one will never get rid of the strikeout tag for dubious reasons.)

Comment by arromdee on New organization - Future of Life Institute (FLI) · 2014-06-13T21:34:09.193Z · LW · GW

Since you invoked TV Tropes, there's a TV Tropes fork at https://allthetropes.orain.org/wiki/ . It gets rid of the censorship at TV Tropes and also uses mediawiki, which makes things work better--you have real categories, it is possible to edit sections, etc.

Comment by arromdee on Critiquing Gary Taubes, Part 4: What Causes Obesity? · 2013-12-30T23:37:38.439Z · LW · GW

Given that many people here are anime fans, I have an example, sort of. Back when Media Blasters had manufacturing errors that caused many of their disks to have mono audio, fans complained and Media Blasters claimed that their experts analyzed the disks and found nothing wrong with them.

Needless to say, the disks did have mono audio.

Of course, that's only sort of an example because it's just as likely that the company was simply lying about having consulted experts.

Comment by arromdee on Your Price for Joining · 2013-12-07T19:55:15.344Z · LW · GW

The point is not that free software programmers specifically refuse to accept wrongly indented code, the point is that they often refuse to accept code based on wholly arbitrary reasons. Arguing that indentation really isn't an arbitrary reason is fighting the hypothetical; replace it in your mind with something that is.

There's also the "we won't accept this bug report unless it fits this list of arbitrary requirements" gambit (if you actually do manage to submit the bug report following all the requirements, it will still get ignored anyway, but doing it this way they can artificially deflate the number of unfixed bugs and blame things on the user for not following the directions)

Comment by arromdee on Book Review: Computability and Logic · 2013-11-21T19:53:13.080Z · LW · GW

The patched version requires three questions. In fact it requires asking three people--if you only ask two people any number of questions, Random could pretend that he is the other person and the other person is Random.

First of all, you need a question which lets you determine who any person B is, when asked of Truth.

You want to ask "if B is Truth, then yes, else if B is False, then no, else don't answer". Presumably, you can't directly ask someone not to answer--they can only refuse to answer if they are Random or if yes/no would violate constraints, so this comes out to "if B is Truth, then yes, else if B is False, then no, else tell me if your answer to this question is 'no'."

Then you modify this question so that it can be asked either of Truth or False. As before, adding "tell me if the answer to Y is the truthfulness of your answer to this question" will produce a correct answer to a yes/no question from either True or False, so you get "tell me, in the case that B is not Random, if the answer to "if B is Truth, then yes, else no" is the truthfulness of the answer to your question, and in the case that B is Random, if your answer to this question is the negation of the truthfulness of your answer to this question'".

You now have a question that can determine who one person is, when asked of either True or False.

(The version with da and ja is left as an exercise to the reader.)

Use that question to ask person 1 who person 3 is. Then use it to ask person 2 who person 3 is.

If 1 and 2 give the same answer, then they are either Truth or False giving an informative answer or Random imitating an informative answer. Either way you know the identity of 3, and you also know one non-Random person. Ask this non-Random person the question to find the identity of a second person, which gives you all three.

If 1 and 2 give different answers, then one of them is Random. In that case, you know that 3 is not Random, and you can ask 3 who 1 is. You now know the identity of 1, and you know whether 1 or 2 is Random; the non-Random one told you who 3 was, so you have the identity of 3 as well. This again gives you the identity of two people and so you have all three.

Comment by arromdee on Book Review: Computability and Logic · 2013-11-21T16:45:09.190Z · LW · GW

your two-question solution doesn't work given the constraints imposed by Boolos

If the above is quoted correctly, the constraints imposed by Boolos are contradictory. It is not possible that 1) Random always answers truthfully or falsely and 2) Random always answers "da" or "ja". So the fact that I had to throw out the latter constraint is of no import--since the constraints are contradictory, I had no choice but to throw one out.

Comment by arromdee on Book Review: Computability and Logic · 2013-11-21T15:39:52.748Z · LW · GW

Lurker, but I just had to post here. A version of this was posted on The Big Questions in July. Here is my answer, pasted from there (but modified to use the different names), which beats the given answer because it uses two questions.

Let Y be “is the answer to X ‘da’”. If they respond ‘da’, that’s equivalent to saying ‘yes’ to X, and if they respond ‘ja’, that’s the equivalent of saying ‘no’ to X. This is the case even if they said ‘yes’ or ‘no’ because they lied.

“Tell me whether the correct answer to Y is the truthfulness of your answer to this question” will produce the answer to Y from anyone (True, False, or Random). You can ask it three times (with X being various ‘are you a ___’) and get correct yes/no answers all three times, which is enough to tell 6 combinations apart.

If you want to do better than that you need more than one bit per answer, which is possible by asking a question that Random cannot answer with either a yes or a no. Use a disjunction. “Tell me, in the case that you are not Random, whether the correct answer to Y is the truthfulness of your answer to this question, and in the case that you are Random, whether your answer to this question is the negation of the truthfulness of your answer to this question” will get an answer to Y from True or False, and no answer from Random. If X is ‘are you True’ and Y is the da version from above, then the entire question will be answered ‘da’ by True, ‘ja’ by False, and not at all by Random. This provides an obvious way to do it in 2 questions.

(break for formatting)

Whether Random speaks truly or not should be thought of as depending on the flip of a coin hidden in his brain; if the coin comes down heads, he speaks truly; if tails, falsely.

Random will answer da or ja when asked any yes-no question.

These two are not equivalent. The first of these allows you to exploit the fact that some yes-no questions cannot be answered truthfully or falsely, allowing the answer above. The second does not, and implies that some answers from Random are neither true nor false.

Comment by arromdee on Time turners, Energy Conservation and General Relativity · 2013-04-16T22:13:42.971Z · LW · GW

To say that something is conserved means that it is the same at one time as it is at another time.

If you cannot time travel, and you have a set of objects at 1 PM, then you can compare them to the same set of objects at another time, such as an hour later.

If you can time travel, you can do the same--but terms such as "at another time" and "an hour later" become tricky.

With time travel, the time as measured in the setting is not the same as the time as measured by the objects themselves. If some of those objects time travel from 2:30 back to 1:30, then at 2 PM, 1 hour passed in the setting, you have some objects for which 1 hour has passed, and you have other objects for which 2 hours have passed. If you add those objects up just because 1 hour has passed in the setting you are adding the wrong things. You should be adding the objects for which one hour has passed (ignoring the objects for which two hours have passed) because conservation means that the amount is preserved one hour later--you can't mix objects from one hour later and from two hours later and expect to get an amount that is conserved. The fact that one hour has passed in the setting is useful in the non time travel case because the time that has passed in the setting is the same as the time that has passed for all of the objects. In the time travel case the fact that one hour has passed in the setting is just a distraction.