By Gert Almkvist (auth.), Ilias S. Kotsireas, Eugene V. Zima (eds.)

This quantity, as Andrew M. Odlzyko writes within the foreword, “commemorates and celebrates the lifestyles and achievements of a rare person.” initially conceived as an eightieth birthday tribute to Herbert Wilf, the well known combinatorialist, the e-book has advanced past the proceeds of the W80 tribute.

Professor Wilf used to be an award-winning instructor, who used to be supportive of ladies mathematicians, and who had an surprisingly excessive share of girls between his PhD applicants. He was once Editor-in-chief of the yankee Mathematical per 30 days and a founding father of either the magazine of Algorithms and of the digital magazine of Combinatorics. yet he used to be first a researcher, pushed by way of his wish to comprehend and clarify the interior workings of the mathematical world.

The publication collects high quality, refereed examine contributions through a few of Professor Wilf’s colleagues, scholars, and collaborators. some of the papers provided the following have been featured within the 3rd Waterloo Workshop on desktop Algebra (WWCA 2011, W80), held could 26-29, 2011 at Wilfrid Laurier collage, Waterloo, Canada. Others have been incorporated as a result of their courting to his very important paintings in combinatorics. All are offered as a tribute to Herb Wilf’s contributions to arithmetic and mathematical life.

**Read Online or Download Advances in Combinatorics: Waterloo Workshop in Computer Algebra, W80, May 26-29, 2011 PDF**

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**Extra info for Advances in Combinatorics: Waterloo Workshop in Computer Algebra, W80, May 26-29, 2011**

**Sample text**

2n In Maple’s answer occur expressions like which need interpretation. Hereby 4n one needs the following expansions to turn the binomial coefficients “upside down” ! n C "/ 1 ! "2 / 4n n 2n ! n C "/ . 1/n ! n C "/ 3n n 2n Glaisher’s Formulas for 1 2 and Some Generalizations ! n C "/ C 2 ! n C "/ C 6 17 1 ! n C 1/ 2n 1 ! n; k C 3n/ we get 1 X . 2 ! n/ ! n/ D 4038912n8 C 13296384n7 C 18184448n6 C 13423232n5 C5828864n4 C 1523184n3 C 234144n2 C 19440n C 675 Conjecture. 2 8 ˆ ˆ ˆ ˆ . 1/k ˆ k 1

Part (b) is established by induction. The statement holds for Bm;1 . mod 22 1 / for 0 Ä i Ä 2m 1 1; Complementary Bell Numbers: Arithmetical Properties and Wilf’s Conjecture 43 by part (a) and Lemma 10. mod 22 1 /: t u The next results describe the powers of Pm considered modulo 2i . n/. Notation: dm D 3 2m . Proposition 7. mod 2/: Proof. For m D 1, a direct calculation shows that P13 D I and so P1d1 D P16 D I . mod 2/. For simplicity, drop the subscripts in the matrices. mod 4/ 44 T. Amdeberhan et al.

Assume the claim holds for m. Observe that 2m mC4 for m 4, therefore the 2m congruence modulo Â 2 ofÃ Lemma 11 can be replaced with a congruence modulo X Y 2mC4 . Write V D to obtain ZW Â dm PmC1 Á P 0 V P Â Ã C2 m AB C D Ã 1 2mC2 R 0 0 I C 2m Q B 4. / I C 4. / 2m . / 2m . / C C ÁB @ X C 2m . / Y C 2m . / I C 2m . / 2m . / A 4. / I C 4. / Z C 2m . / W C 2m . mod 2mC4 /: Squaring this matrix gives 0 d mC1 PmC1 1 0 0 I C 2mC1 Q 2mC3 R B 4. / I C 4. / 4. / 4. / C C ÁB @ 2X C 4. / 2Y C 4. / I C 4. / 4.