Knights always tell the truth while knaves always lie. Bbc, christianity, funny, religion, stephen fry, video. Can you determine who is a knight and who is a knave. Bbc two and bbc one panel show about quite interesting facts.

In this case, john is a knave and bill is a knight. Every inhabitant of the island is either a knight or a knave, and everyone knows which inhabitants are knights and which are knaves. It was created by john lloyd, and was hosted by stephen fry until the end of series m after which sandi toksvig took over, and features permanent panellist alan davies. So you think public sector staff are knights not knaves. These puzzles were popularized in books by raymond smullyan. Qi series k, episode 12 knights and knaves british. Here is an excellent puzzle with 3 types of characters. Dec 31, 2007 download knights of honor torrent or any other torrent from windows category. The name was coined by raymond smullyan in his 1978 work what is the name of this book the puzzles are set on a fictional island where all inhabitants are either knights, who always tell the truth, or knaves, who always lie.

To start the series off, lets have a simple conversation with these knaves and these knights. Knights and knaves logic puzzles were made popular by the logician and mathematician raymond smullyan. Other people have found out about the knights and knaves, and some have moved to the island. You might remember a knights and knaves puzzle from the 1986 fantasy film, labyrinth. The nice thing about this whole setup is that, covering the last two cases, any statement whatsoever is reducible to one of the above forms based on the permutations it eliminates. Smullyan 1978 is a rich source of these puzzles, of which the following is an example. Remember, everything a knight says is true and everything a knave says is false. Mar 15, 2005 a very special island is inhabited only by knights and knaves. Download knights of honor torrent or any other torrent from windows category.

Knights always tell the truth they never lie, while knaves always lie they never tell the truth. If you asked me, i would say that b is the spy or if you asked, i would say c is not the spy this statement means that c is not the spy. If there are two knights, a is one of them, and he would have said truthfully that there are two knights. We have three people a, b, and c on the island of knights and knaves. On the island of knights and knaves, you meet three people, jack, jill, and jim. The premise of the knights and knaves problem is as follows. Mo and nellie are the same type of islander as robby. Knight and knaves in 1978, raymond smullyan, a professor of mathematical logic, produced a book with the whimsical title what is the name of this book. The problem was developed and popularized by mathematician raymond smullyan, who is known well, maybe not for being prolific in recreational mathematics. All the knights and knaves problems assume that each person encountered is either a knight or a knave, but not both. You are allowed to ask questions of the form person i, is person j a knight.

Knights, knaves, and logical reasoning fabio papacchini 1 puzzles in these exercises, you have met two natives called, imaginatively, a and b and you wish to establish as much information as you can about their status as knights or knaves. Where can i find questions for knights and knaves to practice. Knights and knaves is a basic puzzle used in the fields of mathematics, analysis, or any area of study that utilizes logic. Its just that knights and knaves are guaranteed to make opposite claims about the two other people as to whether theyre the spy. The knights and spies problem is just like the knights and knaves problem except that agents which are not knights are spies. His most famous have to do with a mythical island of knights and knaves. On this island, there are people called knights who always tell the truth and knaves who always lie. View knights and knaves logicpuzzles 2 from cs 1501 at university of pittsburgh. Qi series k, episode 12 knights and knaves british comedy guide. This was a collection of ingeneous and challenging logical puzzles that popularized knights, who always told the truth, and knaves, who always lied. If the number of people n is even, then there are n2 knaves and n2 knights. Unlike any other quiz show you will have failed to avoid catching, qis questions are impossible to answer, but at least the guest panel of topshelf comedians can laugh at themselves and the universe in general while trying. View knightsandknaveslogicpuzzles 2 from cs 1501 at university of pittsburgh. Think again, says julian le grand wed 17 sep 2003 11.

Dec 07, 2017 you might remember a knights and knaves puzzle from the 1986 fantasy film, labyrinth. Qi series k, episode 12 knights and knaves british comedy. Qi stands for quite interesting and is a hilarious quizshow where the guests get points for giving interesting answers. Examples if a says \i am a knight then what we can infer from the. There is an excalibur casino in las vegas which holds a mock jousting contest as part of their dinner show. Jul 10, 2009 the setting for these puzzles is an island, all of whose inhabitants are either knights or knaves. Knights and knaves logic puzzle 1 quiz by twotoneteacher. An islander call him a made a statement about himself and a friend, call him b. Qi s17e16 quads and quins hdtv x264linkle eztv 148. Victoria coren, sue perkins, rev richard coles and alan davies are his guests at the round table. Victoria coren, sue perkins, rev richard coles and alan davies are his guests at the.

Knights templar, and there are still some knights templar lying around. I met two men who lived there and asked the taller man if they were both knights. A journey to the land of logic altha rodin math teachers circle of austin september 25, 2014 tweedledee. Aug 19, 2015 what is the name of this book, by ramond m.

Knights and knaves another truth and liar problem brilliant. Knight, knave and joker puzzle puzzling stack exchange. On the island of knights and knaves there live only two types of people. He replied, but i could not figure out what they were, so i asked the shorter man if the taller was a knight. Knights and knaves these problems are quoted or sometimes modified from the wonderful logic puzzle books of raymond smullyan, in particular his book what is the name of this book. The task is to logically deduce a fact usually on the identity of the knight or knave. The last two statements have the property that knightsknaves give identical answer to the question posed, and the statement reveals something about another role without revealing anything about the speaker. Where can i find questions for knights and knaves to. All knights and knaves problems assume that knights always tell the truth and knaves always lie. We found subtitles for the program knights and knaves.

The knights are on the bottom row tarot cards and the knaves are on the top row jacks, in poker cards. It airs on fridays and in a longer format xl on saturdays on bbc two. Each series covers topics that begin with a different letter of the alphabet. Download subtitles for knights and knaves with victoria coren, sue perkins, rev richard coles and alan davies. Knights and knaves is a type of logic puzzle where some characters can only answer questions truthfully, and others only falsely. Qi s17e16 quads and quins 720p hdtv x264linkle eztv 394. Qi k episode 12 knights and knaves dailymotion video. A knights and knaves puzzle typically consists of a challenge to make a logical deduction based on the simplicity of the setting. I wont go too deep into their history as you will easily find that in many other sources. Smullyan, has a whole bunch of logical puzzles, especially ones about truth logic, in the form of problems with knights and knaves, dracula, alice in wonderland and so forth. A very special island is inhabited only by knights and knaves. Johns statement cannot be true, because a knave admitting to being a knave would be the same as a liar telling the lie i am a liar, which is known as the liar paradox. Qi xl s11 ep12 knights and knaves hd stream watch qi xl s11 ep12 knights and knaves online watch qi xl s11 ep12 knights and knaves online stream. Dec 30, 2015 mo and zoe are either both knights or both knaves.

A guide to knights and knaves, episode 12 from series k of qi. You ask jack whether he is a knave, but cant make out his response. There is an island far off in the pacific, called the island of knights and knaves. Sep 17, 2003 so you think public sector staff are knights not knaves. Chris knight 1998 a pretty good guy 2001 the jealous kind 2003 enough rope 2006 from. Richard coles, victoria coren mitchell and sue perkins. In the classic knights and knaves problem, there are n people in a room each of whom is a knight or a knave. Qi short for quite interesting is a bbc comedy panel game television show that began in 2003. Qi knights and knaves tv episode 20 release info imdb.

More formally, if we decide to represent the statement p is a knight by p, then the statement p is a knave is represented by. Knights and knaves puzzle 1 every person is either a knight or a knave. John and bill are residents of the island of knights and knaves. B would violate the assumption if a was a knave and b was a knight, b would voilate the assumption only if they both are knaves can they satisfy the assumptions. Therefore, depending on what a is, the actual number of knights is either 1 or 2 if there are two knights, a is one of them, and he would have said truthfully that there are two knights. Knights who always speak the truth and knaves who always lie. The first knight has x knaves to his left and y1 knights to his right, so x y1. Therefore, depending on what a is, the actual number of knights is either 1 or 2. Qi xl s11 ep12 knights and knaves hd watch dailymotion. Amy, bob, and celine are from the island of knights, knaves, and normals.

When the sixth series of qi began in 2008, the show moved to bbc one and the broadcasting of episodes on bbc four was replaced in favour of an extended repeat broadcast on bbc two the following day, titled qi xl. Now, knights are people who always tell the truth and knaves always lie. As you approach the island, you spot three inhabitants on the shore. Knights still always tell the truth, knaves always lie, but normals can do either. You ask jill what jack said, and she replies, jack said that he is a knave. Knights always tell the truth, and knaves always lie. B would violate the assumption if a was a knight an b was a knave.

1100 1027 1101 281 686 1154 159 1159 1321 159 431 403 997 237 1416 1102 343 1315 802 712 1083 135 1127 1515 975 1225 479 1338 1327 148 582 1500 684 619 738 1099 1056 8 276 201 1459 192