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: ''For the movie, see Palindromes (movie) '' A palindrome is a word, phrase, Number or other sequence of units (such as a strand of DNA ) that has the property of reading the same in either direction (the adjustment of punctuation and spaces between words is generally permitted). The word "palindrome" comes from the Greek πάλιν (''palin'') "back" and δρóμος (''dromos'') "way, direction". Composing literature in palindromes is an example of Constrained Writing . HISTORY According to ). The Romans enjoyed palindromes too, as demonstrated by "In girum imus nocte et consumimur igni" ("We enter the circle at night and are consumed by fire"), which was said to describe the behavior of moths. The Latin palindrome " Sator Arepo Tenet Opera Rotas " is remarkable for the fact that it also reproduces itself if one forms a word from the first letters, then the second letters and so forth. Hence it can be arranged into a Word Square that reads in four different ways: horizontally or vertically from top left to bottom right; and horizontally or vertically from bottom right to top left. While some sources translate this as "The sower Arepo holds the wheels at work", translation is problematic as the word ''arepo'' is otherwise unknown; for further discussion, See Separate Article . A palindrome with the same property is the Hebrew palindrome "פרשנו רעבתן שבדבש נתבער ונשרף", ("parashnu ra'avtan shebadvash nitba'er venisraf"), meaning "We explained the glutton who is in the honey was burned and incinerated", by Ibn Ezra , referring to the Halachic question as to whether a fly landing in honey makes the honey non- Kosher .
PALINDROMES IN DIFFERENT LANGUAGES Japanese palindromes, called Kaibun , rely on the Hiragana Syllabary . An example is the word ''shinbunshi'' (in syllables ''shi-n-bu-n-shi''), meaning "newspaper". The Japanese syllabary makes it possible to construct very long palindromes. A Chinese word is a Character , and is not composed of letters or syllables. Therefore, a Chinese word itself cannot be a palindrome. Chinese palindromes have to be phrases or sentences and are much more easy to construct than in languages written with an alphabet. For example, the phrase "我愛媽媽，媽媽愛我" ("I love mother, mother loves me") is a palindrome. Palindromic poetry" (回文詩) was a literary genre in Classical Chinese literature. The "forward reading" and the "backward reading" of such a poem would be similar but not exactly the same in meaning. The following palindromic poem was composed during the Song Dynasty :
The "forward reading" is about husband missing wife while the "backward reading" wife missing husband. TYPES OF PALINDROME :''Examples of palindromes are listed at Palindromic Words and Palindromic Phrases .'' Symmetry by characters The most familiar palindromes, in English at least, are character-by-character: the written characters read the same backwards as forwards. Palindromes may consist of a single word (such as "''civic''"), a phrase or sentence ("''Was it a cat I saw?''"), or a longer passage of text. Spaces, punctuation and case are usually ignored. Three famous English palindromes are: "Able was I ere I saw Elba," honoring the first exile of Napoleon , "A man, a plan, a canal. Panama," commemorating Theodore Roosevelt , and "Madam, I'm Adam," generally said to refer to the beginning of man in the Bible . Symmetry by words Some palindromes use words as units rather than letters. An example is "''You can cage a swallow, can't you, but you can't swallow a cage, can you?''". Symmetry by lines Still other palindromes take the line as the unit. The poem '' Doppelganger ,'' composed by James A. Lindon, is an example. The dialogue " Crab Canon " in Douglas Hofstadter 's Gödel, Escher, Bach is nearly a line-by-line palindrome. The second half of the dialog consists, with some very minor changes, of the same lines as the first half, but in reverse order and spoken by the opposite characters (i.e., lines spoken by Achilles in the first half are spoken by the Tortoise in the second, and vice versa). In the middle is a non-symmetrical line spoken by the Crab, who enters and spouts some nonsense, apparently triggering the reversal. The structure is modeled after the musical form known as Crab Canon , in particular the ''canon a 2 cancrizans'' of Johann Sebastian Bach 's '' The Musical Offering ''. Symmetry by sound Some palindromes are by sound, such as the Hungarian ''A bátya gatyába'' ("The brother in underpants"), or the Japanese ''Ta-ke-ya-bu ya-ke-ta'' (竹薮焼けた) ("A bamboo grove has been burned"). Numbers ''See main article: Palindromic Number '' Dates and times Palindromes can also be constructed using dates and times. The exact dates and times may differ according to the local style (for example, whether the month or day is written first). For example:
Palindrome Years happen once a century. In music Nerdcore Rapper MC Paul Barman , in his song ''Bleeding Brain Grow'' from the album '' Paullelujah '', raps several lines written in palindrome, mostly name-dropping some of his favorite rappers: "Eve, Mika, RZA, Evil JD, Nasir is Osiris, and J. Live, AZ, Rakim, Cormega, Cage, Mr. O.C., I'm Anomi. I, mon ami!" On his 2003 album '' Poodle Hat '', the comedy singer "Weird Al" Yankovic included a song called ''Bob'' composed entirely of rhyming palindromes. The name ''Bob'' is itself a palindrome, and is also a reference to Bob Dylan , whose '' Subterranean Homesick Blues '' he emulated in both the song's style and the accompanying video. The title of '' Aoxomoxoa '' (pronounced "OX-OH-MOX-OH-AH") by the Grateful Dead is a palindrome. The singer and guitarist Baby Gramps wrote and performs a song entitled ''Palindromes''. Boards Of Canada 's song "A is to B as B is to C" contains an audio palindrome. The musical duo of John Linnell and John Flansburgh, also known as They Might Be Giants , wrote a song related to palindromes called '' I Palindrome I ''. The song appears on their album ''Apollo 18''. At one point in the song, the lyrics are the same forwards as backwards: "Son, I am able she said though you scare me, watch, said I, beloved, I said watch me scare you though, said she able am I, son." The Iceland ic Band Sigur Rós composed a song on their album '' Ágætis Byrjun '' which partly sounds the same played forwards or backwards. The notes have a symmetric form, and a reversed version of the music is mixed over the original. The song—named ''Starálfur''—can be Download ed from their Website {Link without Title} . The singer-songwriter-violinist Andrew Bird wrote and performs a song entitled ''Fake Palindromes''. It is performed on the album Andrew Bird & the Mysterious Production of Eggs. The interlude from Alban Berg 's opera '' Lulu '' is a palindrome, as are sections and pieces, in Arch Form , by many other composers, including James Tenney (swell), and most famously Béla Bartók (and, influenced by him, Steve Reich ). In 1992, the band Soundgarden released an EP entitled Satanoscillatemymetallicsonatas, or SOMMS for short. The title itself is a palindrome. In Finland, Tapani Länsiö composed a choral work which is a palindrome both musically, and lyrically, ''Atte kumiorava, varo imuketta'' (Atte the rubber-squirrel, do beware the cigar-holder). See also Crab Canon — in Classical Music , a Canon in which one line of the melody is reversed in time and pitch from the other. Computer programs Brian Westley wrote a C program for the 1987 International Obfuscated C Code Contest which is a line-by-line palindrome: http://www.ioccc.org/1987/westley.c Up to the type definitions, here is a compilable palindrome written in Caml : type 'a elbatum = 'a ;; type lol = bool ;; type pop = int ;; type b = { mutable lol : lol elbatum } ;; type i = { mutable pop : pop elbatum } ;; fun erongi lol pop n -> pop.lol <- let nuf = erongi ; fun erongi lol pop n -> pop.lol ; ignore n in erongi ; lol.pop <- n pop lol ignore nuf ; ignore = fun tel -> lol.pop <- n pop lol ignore nuf ;; LONG PALINDROMES The longest palindromic word in the Oxford English Dictionary is ''tattarrattat'', coined by James Joyce in Ulysses for a knock on the door. The ''Guinness Book of Records'' gives ''detartrated'', the past tense of ''detartrate'', a somewhat contrived chemical term meaning to remove Tartrate s. Rotavator , a trademarked name for an agricultural machine, is often listed in dictionaries. The term ''redivider'' (i.e. someone or something that redivides) is used by some writers but appears to be an invented term - only ''redivide'' and ''redivision'' appear in the "Shorter Oxford Dictionary". '' Malayalam '', an Indian language, is of equal length. ''Saippuakauppias'', Finnish for "soap vendor", is claimed to be the world's longest palindromic word in everyday use. A meaningful derivative from it is ''saippuakalasalakauppias'' (soapfish bootlegger). An even longer effort is ''saippuakuppinippukauppias'' (soapdish batch seller) ''Koortsmeetsysteemstrook'', is probably the longest palindrome in Dutch, and ''Kuulilennutunneliluuk'' (trajectory tunnel hatch) is the longest palindrome in Estonian. To celebrate 20:02 02/20 2002, a palindromic day, Peter Norvig wrote on that day a computer program which produced the world's longest palindromic sentence , running to 17,256 words [http://www.norvig.com/palindrome.html]. A long palindrome in English that reads more easily and attempts to flow is reproduced here . In 1991, Gordon Dow composed a 306 word palindrome titled Dog Sees Ada. This palindrome is famous for using very few contrived words. It is reproduced here . Stanisław Barańczak , a Polish poet and translator created a ''Mega-Palindromadery'' which is based on symmetry by letters. This work in Polish Language is composed of 4 introductory small palindromes (as the author called them, 'fanfares') and the main 2,501-letter palindrome. BIOLOGICAL STRUCTURES In most Genomes or sets of Genetic instructions, palindromic motifs are found. However, the meaning of palindrome in the context of genetics is slightly different than the definition used for words and sentences. Since the DNA is formed by two paired strands of Nucleotides , and the Nucleotides always pair in the same way ( Adenine (A) with Thymine (T), Cytosine (C) with Guanine (G)), a (single-stranded) sequence of DNA is said to be a palindrome if it is equal to its complementary sequence read backwards. For example, the sequence ACCTAGGT is palindromic because its complement is TGGATCCA, which is equal to the original sequence in reverse. A palindromic DNA sequence can form a Hairpin . Palindromic motifs are made by the order of the Nucleotides that specify the complex chemicals ( Proteins ) which, as a result of those Genetic instructions, the Cell is to produce. They have been specially researched in Bacterial chromosomes and in the so-called Bacterial Interspersed Mosaic Elements (BIMEs) scattered over them. Recently a research genome sequencing project discovered that many of the bases on the Y chromosome are arranged as palindromes. A palindrome structure allows the Y chromosome to repair itself by bending over at the middle if one side is damaged. PHILOSOPHY OF NATURE Some philosopher-scientists report a palindromic relationship between the readings ascribing a sense to what is found going on in the universe can be obtained in both directions, or not. On this alternative, it is claimed, pivots the possibility of ascertaining, ''e.g.'', whether conscious beings are worthier than non-conscious nature, or not - a topic assumed consequential for Philosophy , Ecology , Ecofeminism and Biocentric Environmental movements, and Ethics . COMPUTATION THEORY In Automata Theory , a Set of all palindromes in a given Alphabet is a typical example of a Language which is Context-free , but not Regular . It is also an example of a context-free language which cannot be accepted by a deterministic Pushdown Automaton . {Link without Title} FURTHER EXAMPLES For numerous further examples of palindromes in a variety of different languages see Palindromic Words and Palindromic Phrases . POKING FUN AT PALINDROMES In their famous ''Dead Parrot'' sketch Monty Python poke fun at palindromes: ''Shopkeeper'': I said Bolton - it was a palindrome. ''Customer'': A palindrome?! The palindrome of Bolton would be Notlob - it dont work! SEE ALSO
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