Power Series Composition and Change of Basis

Efficient algorithms are known for many operations on truncated power series (multiplication, powering, exponential, . . . ). Composition is a more complex task. We isolate a large class of power series for which composition can be performed efficiently. We deduce fast algorithms for converting polynomials between various bases, including Euler, Bernoulli, Fibonacci, and the orthogonal Laguerre, Hermite, Jacobi, Krawtchouk, Meixner and Meixner-Pollaczek. Categories and Subject Descriptors:

• Type: Journal
• Year: 2008
• Where: CORR
• Authors: Alin Bostan, Bruno Salvy, Éric Schost
• Keywords: Complex Task, CORR 2008, Education, Efficient Algorithms, Power Series