Efficient Conversion of Holonomic Sequences to Simple Rational Recursive Sequences

核心概念

Every holonomic sequence can be converted to a simple rational recursive sequence of order at most the order of the original holonomic sequence plus its degree.

要約

The paper investigates the problem of converting holonomic sequences, which are solutions to linear difference equations, into simple rational recursive sequences, which are solutions to rational recurrence relations.

The key insights are:

1. Proposition 1 shows that every holonomic sequence of degree 1 can be converted to a simple rational recursive sequence of order at most one higher than the original holonomic sequence.

2. Proposition 2 extends this result to holonomic sequences of degree up to 3, showing they can be converted to simple rational recursive sequences of order at most two higher than the original.

3. Theorem 2 provides a general result, proving that every holonomic sequence of order l and degree d can be converted to a simple rational recursive sequence of order at most l+d.

The paper presents two algorithms for this conversion. The Gröbner bases method iteratively computes elimination ideals to find a simple rational recursive generator of minimal order. The linear algebra method directly constructs the simple rational recursive equation based on the proof of Theorem 2, sacrificing minimality of order for better efficiency.

The authors demonstrate the application of these algorithms on several examples, including converting polynomial and C-finite sequences to simple rational recursive form. The results show that holonomic sequences can be efficiently converted to a more restricted class of sequences with a rational recursive structure.

統計

None.

引用

None.

抽出されたキーインサイト

On Rational Recursion for Holonomic Sequences

by Bertrand Teg... 場所 arxiv.org 05-01-2024

https://arxiv.org/pdf/2404.19136.pdf

深掘り質問

How can the Gröbner bases method be further optimized to handle higher-degree holonomic sequences more efficiently

To optimize the Gröbner bases method for handling higher-degree holonomic sequences more efficiently, several strategies can be employed:

Improved Variable Ordering: Utilizing a more efficient variable ordering strategy can reduce the computational complexity of the Gröbner basis computation. By prioritizing variables that are more likely to lead to simpler equations, the algorithm can converge faster.

Incremental Gröbner Bases: Instead of computing the Gröbner basis for the entire system at once, an incremental approach can be adopted. By gradually adding variables or equations and updating the Gröbner basis iteratively, the method can handle larger and more complex systems more effectively.

Parallelization: Implementing parallel processing techniques can distribute the computational load across multiple processors or cores, speeding up the Gröbner basis computation for higher-degree holonomic sequences.

Memory Management: Efficient memory allocation and management can prevent unnecessary memory overhead, especially when dealing with large systems of equations. By optimizing memory usage, the method can handle higher-degree sequences more effectively.

Algorithmic Improvements: Constant refinement and optimization of the underlying algorithms used in the Gröbner bases method can lead to overall efficiency gains. This includes fine-tuning the algorithm parameters, reducing redundant computations, and enhancing the overall computational workflow.

By incorporating these optimizations, the Gröbner bases method can be tailored to handle higher-degree holonomic sequences more efficiently, providing faster and more accurate results.

What are the potential applications of being able to convert holonomic sequences to simple rational recursive form, beyond the examples provided in the paper

The ability to convert holonomic sequences to simple rational recursive form has various potential applications beyond those outlined in the paper:

Automata Theory: In the field of automata theory, converting holonomic sequences to simple rational recursive form can aid in the analysis and optimization of automata models. It can help identify patterns and regularities in automata behavior, leading to improved design and efficiency.

Signal Processing: In signal processing applications, converting holonomic sequences to simple rational recursive form can facilitate the modeling and analysis of signal patterns. This conversion can help in signal prediction, noise reduction, and signal reconstruction tasks.

Cryptography: The conversion of holonomic sequences to simple rational recursive form can have implications in cryptography, particularly in generating pseudo-random sequences for encryption purposes. Understanding the underlying recursive structure can enhance cryptographic algorithms' robustness and security.

Data Compression: By converting holonomic sequences to simple rational recursive form, data compression algorithms can leverage the recursive properties to efficiently represent and store data. This can lead to more compact data representations and faster compression and decompression processes.

Machine Learning: In machine learning applications, converting holonomic sequences to simple rational recursive form can aid in feature extraction, pattern recognition, and predictive modeling. It can provide insights into the underlying structure of data sequences, enhancing machine learning algorithms' performance.

Are there any other classes of sequences beyond holonomic that can be efficiently converted to simple rational recursive form using similar techniques

Beyond holonomic sequences, other classes of sequences that can be efficiently converted to simple rational recursive form using similar techniques include:

Linear Recurrence Sequences: Sequences that satisfy linear recurrence relations can be converted to simple rational recursive form by identifying the underlying linear equations governing the sequence. By transforming these sequences into a simple recursive form, their properties and behaviors can be analyzed more effectively.

Periodic Sequences: Periodic sequences with a repeating pattern can be converted to simple rational recursive form by capturing the periodicity in the recursive equations. This conversion can aid in understanding the periodic nature of the sequence and predicting future values based on the recursive structure.

Geometric Sequences: Geometric sequences, characterized by a common ratio between consecutive terms, can be transformed into simple rational recursive form by expressing the ratio as a rational function. This conversion can reveal the underlying geometric progression and facilitate analysis and prediction of the sequence.

By applying similar techniques used for holonomic sequences, these classes of sequences can be efficiently converted to simple rational recursive form, enabling a deeper understanding of their properties and behaviors.