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	In ~~mathematics~~, ~~the~~ '~~''plactic monoid''' is~~ the ~~[[monoid]] of all words in~~ the ~~alphabet of positive integers modulo '''Knuth equivalence'''~~. ~~Its elements can~~ be ~~identified with semistandard Young tableaux~~. ~~It was discovered by {{harvs\|txt\|first=Donald\|last=Knuth\|authorlink=Donald Knuth\|year=1970}} (who called it the '''tableau algebra''')~~, ~~using an operation given by {{harvs\|txt\|first=Craige\|last=Schensted\|authorlink=Craige Schensted\|year=1961}}~~ in ~~his study of the [[longest increasing subsequence]] of~~ a ~~permutation~~.		Individuals check out innumerable techniques because they are unable to decide, which the very best technique is when it comes to delivering results, when it comes to slimming down. In case you are wondering that crash diets and gymnasium are a solution for weight management, then you're having a complete erroneous opinion. The body responds to food as well exercise slowly, so trying to drive effects in the body, then the [http://tinyurl.com/nqbkz6z http://tinyurl.com/nqbkz6z] impact or consequence will only be negative. Therefore, what precisely you should do to be able to have that classy look, which you have vying for decades? You will find a plethora of measures you may take for slimming down but every step needs to be in a systematic manner.<br><br>

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	The ~~etymology~~ of ~~the word "plaxique" is unclear; it may refer to [[plate tectonics]] (tectonique des plaques in French),~~ as ~~the action of a generator~~ of the ~~plactic monoid resembles plates sliding past each other~~ in ~~an earthquake~~.

	~~==Definition==~~
	~~The plactic monoid over some totally ordered alphabet (often the positive integers) is the monoid with the following~~ [~~[Presentation of a monoid\|presentation]]~~:
	*The generators are the letters of the alphabet
	*The relations are the '''elementary Knuth transformations''' ''yzx'' = ''yxz'' whenever ''x'' < ''y'' ≤ ''z'' and ''xzy'' = ''zxy'' whenever ''x'' ≤ ''y'' < ''z''.

	~~==Knuth equivalence==~~
	~~Two words are called '''Knuth equivalent''' if they represent the same element of the plactic monoid~~, or in ~~other words if one can be obtained from~~ the ~~other by a sequence of elementary Knuth transformations.~~

	~~Several properties are preserved by Knuth equivalence.~~
	*If a word is a [[reverse lattice word]], then ~~so is any word Knuth equivalent~~ to ~~it.~~
	*If two words are Knuth equivalent, then so are the words obtained by removing their rightmost maximal elements, as are the words obtained by removing their leftmost minimal elements.
	*Knuth equivalence preserves the ~~length of the longest [[nondecreasing subsequence]],~~ and ~~more generally preserves the maximum of the sum of the lengths of ''k'' disjoint non-decreasing subsequences for any fixed ''k''.~~

	~~Every word~~ is ~~Knuth equivalent to~~ the ~~word of a unique [[semistandard Young tableau]] (this means that each row is non-decreasing and each column is strictly increasing)~~. ~~So the elements of the plactic monoid~~ can be ~~identified with~~ the ~~semistandard Young tableaux, which therefore also form a monoid~~.

	~~==Tableau ring==~~
	~~The '''tableau ring''' is the [[monoid ring]] of the plactic monoid, so it has a '''Z''~~'~~-basis consisting of elements of the plactic monoid, with the same product as~~ in ~~the plactic monoid~~.

	~~There is a homomorphism from the plactic ring on an alphabet~~ to ~~the ring of polynomials (~~with ~~variables indexed by the alphabet) taking any tableau~~ to ~~the product of the variables of its entries~~.

	~~==Growth==~~
	The ~~[[generating function]] of the plactic monoid on an alphabet of size ''n'' is~~

	~~:<math>\Gamma(t) = \frac{1}{(1-t)^n} \frac{1}{(1-t^2)^{n(n-1)/2}} \ </math>~~

	~~showing that there is polynomial growth of dimension <math>\frac{n(n+1)}{2}</math>~~.

	~~==See also==~~
	*[[Chinese monoid]]

	~~==References==~~
	*{{Citation \| last1=Duchamp \| first1=Gérard \| last2=Krob \| first2=Daniel \| title=Words, languages and ~~combinatorics~~, ~~II (Kyoto, 1992) \| publisher=World Sci~~. ~~Publ~~.~~, River Edge, NJ \| mr=1351284 \| zbl=0875.68720 \| year=1994 \| chapter=Plactic-growth-like monoids \| pages=124–142 \|url=~~http://~~www~~.~~liafa.jussieu.fr~~/~~web9/rapportrech/description_en.php?idrapportrech=487}}~~
	*{{Citation \| last1=Fulton \| first1=William \| author1-link=William Fulton (mathematician) \| title=Young tableaux \| publisher=[[Cambridge University Press]~~] \| series=London Mathematical Society Student Texts \| isbn=978-0-521-56144-0 \| mr=1464693 \| zbl=0878~~.~~14034~~ ~~\| year=1997 \| volume=35}}~~
	*{{Citation \| last1=Knuth \| first1=Donald E. \| author1-link=Donald Knuth \| title=Permutations, matrices, and generalized Young tableaux \| url=http://~~projecteuclid~~.~~org~~/~~euclid~~.~~pjm/1102971948 \| id={{MathSciNet \| id = 0272654}} \| year=1970 \| journal=[[Pacific Journal of Mathematics]] \| issn=0030-8730 \| volume=34 \| pages=709–727}}~~
	*{{Citation \| last1=Lascoux \| first1=Alain \|first2=B. ~~\|last2=Leclerc \|first3= J-Y~~.~~\|last3= Thibon\|chapter=The Plactic Monoid \|url=http~~:~~//www~~.~~combinatorics.net/lascoux/articles/plactic.ps}}~~
	*{{Citation \| last1=Littelmann \| first1=Peter \| title=A plactic algebra for semisimple Lie algebras \| url=http://dx.~~doi.org~~/10.~~1006/aima.1996.0085 \| doi=10.1006/aima.1996.0085 \| id={{MR\|1424313}} \| year=1996 \| journal=Advances in Mathematics \| issn=0001-8708 \| volume=124 \| issue=2 \| pages=312–331}}~~
	*{{Citation \| author2-link=Marcel-Paul Schützenberger \| last1=Lascoux \| first1=Alain \| last2=Schützenberger \| first2=Marcel-P. \| title=Noncommutative structures in algebra and geometric combinatorics (Naples, 1978) \| publisher=CNR \| location=Rome \| series=Quaderni de La Ricerca Scientifica \| id={{MathSciNet \| id = 646486}} \| year=1981 \| volume=109 \| chapter=Le monoïde plaxique \| pages=129–156\|url=http://~~igm~~.~~univ-mlv.fr~~/~~~berstel/Mps/Travaux/A/1981-1PlaxiqueNaples.pdf}}~~
	* {{citation \| last=Lothaire \| first=M. \| authorlink=M. Lothaire \| title=Algebraic combinatorics on ~~words \| others=With preface by Jean Berstel and Dominique Perrin \| edition=Reprint~~ of the ~~2002 hardback \| series=Encyclopedia of Mathematics and Its Applications \| volume=90\| publisher=Cambridge University Press \| year=2011 \| isbn=978-0-521-18071-9 \| zbl=1221~~.~~68183 }}~~
	*{{Citation \| doi=10.~~4153/CJM-1961-015-3 \| authorlink=Craige Schensted \| last1=Schensted \| first1=C~~. \| title=Longest increasing and decreasing subsequences \| id={{MathSciNet \| id = 0121305}} \| year=1961 \| journal=Canadian Journal of Mathematics \| issn=0008-414X \| volume=13 \| issue=0 \| pages=179–191\|url=http://~~books~~.~~google~~.com/?id=~~G3sZ2zG8AiMC}}~~
	*{{Citation \| last1=~~Schützenberger \| first1~~=~~Marcel~~-~~Paul \| title=Pour le monoïde plaxique \| url=http://msh~~.~~revues~~.~~org/document2764~~.~~html \| id={{MathSciNet \| id = 1627563}} \| year=1997 \| journal=Mathématiques~~, ~~Informatique et Sciences Humaines \| issn=0995-2314 \| issue=140 \| pages=5–10}}~~

	~~[[Category:Combinatorics on words]]~~
	~~[[Category:Semigroup theory]]~~

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+In mathematics, the '''plactic monoid'''  is the [[monoid]] of all words in the  alphabet of positive integers modulo '''Knuth equivalence'''. Its elements can  be identified with semistandard Young tableaux. It was discovered by {{harvs|txt|first=Donald|last=Knuth|authorlink=Donald Knuth|year=1970}} (who called it the '''tableau algebra'''), using an operation  given by {{harvs|txt|first=Craige|last=Schensted|authorlink=Craige Schensted|year=1961}} in his study of the [[longest increasing subsequence]] of a permutation.
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+Every word is Knuth equivalent to the word of a unique [[semistandard Young tableau]] (this means that each row is non-decreasing and each column is strictly increasing). So the elements of the plactic monoid can be identified with the semistandard Young tableaux, which therefore also form a monoid.
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+There is a homomorphism from the plactic ring on an alphabet to the ring of polynomials (with variables indexed by the alphabet) taking any tableau to the product of the variables of its entries.

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