We use results on Dyck words and lattice paths to derive a formula for the exact number of binary words of a given length with a given minimal abelian border length, tightening a bound on that number from Christodoulakis et al. (Discrete Applied Mathematics, 2014). We also extend to any number of distinct abelian borders a result of Rampersad et al. (Developments in Language Theory, 2013) on the exact number of binary words of a given length with no abelian borders. Furthermore, we generalize these results to partial words.
机构:
Univ Witwatersrand, Sch Math, John Knopfmacher Ctr Applicable Anal & Number The, Private Bag 3, ZA-2050 Johannesburg, South AfricaUniv Witwatersrand, Sch Math, John Knopfmacher Ctr Applicable Anal & Number The, Private Bag 3, ZA-2050 Johannesburg, South Africa
Blecher, Aubrey
Brennan, Charlotte
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Univ Witwatersrand, Sch Math, John Knopfmacher Ctr Applicable Anal & Number The, Private Bag 3, ZA-2050 Johannesburg, South AfricaUniv Witwatersrand, Sch Math, John Knopfmacher Ctr Applicable Anal & Number The, Private Bag 3, ZA-2050 Johannesburg, South Africa
Brennan, Charlotte
Knopfmacher, Arnold
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Univ Witwatersrand, Sch Math, John Knopfmacher Ctr Applicable Anal & Number The, Private Bag 3, ZA-2050 Johannesburg, South AfricaUniv Witwatersrand, Sch Math, John Knopfmacher Ctr Applicable Anal & Number The, Private Bag 3, ZA-2050 Johannesburg, South Africa
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Hiroshima Univ, Grad Sch Educ, Dept Math Educ, Higashihiroshima 7398524, JapanHiroshima Univ, Grad Sch Educ, Dept Math Educ, Higashihiroshima 7398524, Japan
Imaoka, Mitsunori
Takata, Isao
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Akashi Natl Coll Technol, Dept Arts & Sci, Akashi, Hyogo 6748501, JapanHiroshima Univ, Grad Sch Educ, Dept Math Educ, Higashihiroshima 7398524, Japan
Takata, Isao
Fujiwara, Yu
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机构:Hiroshima Univ, Grad Sch Educ, Dept Math Educ, Higashihiroshima 7398524, Japan
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Univ Stellenbosch, Dept Math, Stellenbosch, South Africa
NITheCS Natl Inst Theoret & Computat Sci, Stellenbosch, South AfricaUniv Stellenbosch, Dept Math, Stellenbosch, South Africa