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# Tag Archives: Umbral calculus

## Compositional Inverse Operators and Sheffer Sequences

When considering operator inverses, one usually considers multiplicative inverses. As noted earlier in several entries, particularly, “Bernoulli and Blissard meet Stirling … ” (BBS), we see compositional inverse pairs of operators playing an important role in making associations among important … Continue reading

## Dirac-Appell Sequences

The Pincherle derivative is implicitly used in Eqn. 2.19 page 13 of “Mastering the master field” by Gopakumar and Gross. The raising and creation operators in the paper are analogous to those for a Laplace-dual Appell sequence, or Dirac-Appell sequence, … Continue reading

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Tagged Appell polynomial sequences, Appell sequences, Conjugation of operators, Creation and annihilation operators, Differential operators, Dirac delta function, Dirac-Appell sequence, Generalized Appell sequence, Inverse Laplace transform, Ladder operators, Modified Hermite polynomials, Operator calculus, Pincherle derivative, Raising and lowering operators, Umbral calculus
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## Fractional Calculus, Gamma Classes, the Riemann Zeta Function, and an Appell Pair of Sequences

The background info and comments for the MSE question Lie group heuristics for a raising operator for and the MO question Riemann zeta function at positive integers and an Appell sequence of poylnomials introduce an Appell sequence of polynomials containing … Continue reading

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Tagged Appell sequences, Associated Laguerre polynomials, Bell polynomials, Confluent hypergeometric functions, Convolution operators, Creation and annihilation operators, Cycle index polynomials, Differential operators, Digamma function, Falling factorials, Fractional calculus, Gamma classes, Gamma genus, Infinitesimal generators, Inverse Mellin transform, Mellin transform, Psi function, Raising and lowering operators, Riemann zeta function, Rising factorials, Umbral calculus, Umbral compositional inverse pair
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## A Class of Differential Operators and the Stirling Numbers

The differential operator with can easily be expanded in terms of the operators by considering its action on

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Tagged Associahedra, Bell polynomials, Differential operators, Falling factorials, Generalized Dobinski relation, Generalized Stirling numbers, Lah polynomials, Lie derivatives, Moebius transformation, Rising factorials, SL2 group, Stirling numbers of the first kind, Stirling numbers of the second kind, Umbral calculus, Umbral inverse pair, Witt-Lie algebra
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## Bernoulli, Blissard, and Lie meet Stirling and the simplices: State number operators and normal ordering

A set of identities that encapsulates relations among the Bernoulli numbers, the Stirling numbers of the first and second kinds, and operators related to the umbral calculus of Blissard and his contemporaries: Decoding:

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Tagged Appell sequences, Bernoulli polynomials, Compositional inverse, Conjugation and derivation, Differential operators, Finite difference operator, formal group laws, Hurwitz zeta function, Lie derivatives, Lowering operators, Multiplicative inverse, Raising operators, Riemann zeta function, Sheffer sequences, Stirling numbers, Umbral calculus

## Lagrange à la Lah

Lagrange à la Lah Part I and Lagrange à la Lah Part II are a set of notes on partition polynomials derived from binomial Sheffer sequences via umbral refinement, their relation to compositional inversion via the Laplace transform, and their characterization by umbral … Continue reading

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Tagged Bell polynomials, Cayley trees, Composition, Compositional inverse, Differential operators, Faa di Bruno formula, Falling factorial, Forests, Generalized shift operator, Generlized Taylor series, Lagrange inversion, Lagrange partition polynomials, Lah polynomials, Operator calculus, Partition polynomials, Rising factorial, Sheffer sequences, Special functions, Special polynomials, Stirling numbers, Stirling polynomials, Tree graphs, Trees, Umbral calculus, Umbral operator trees
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## Mathemagical Forests

The set of notes Mathemagical Forests is an expansion of the May notes and discusses some connections between rooted trees, derivative operators, Lagrange inversion, the Legendre transformation, the Faa di Bruno formula, Sheffer sequences and umbral calculus, and the infinite dimensional Witt … Continue reading