Simple Science

Cutting edge science explained simply

# Mathematics # Combinatorics # Formal Languages and Automata Theory

The Enigmatic World of Thue-Morse Words

Discover the unique features and applications of Thue-Morse words in math and beyond.

M. Golafshan, M. Rigo, M. Whiteland

― 4 min read


The Mystery of Thue-Morse The Mystery of Thue-Morse Words Thue-Morse sequences. Unearth the secrets and significance of
Table of Contents

Thue-Morse Words are fascinating sequences that show up in various areas of mathematics and even in some unexpected places. At first glance, they might seem like just a string of letters, but they have some unique features. Imagine a word created by flipping a coin repeatedly, where heads adds a letter and tails adds a different one. This results in a word that doesn’t repeat patterns too often, making it quite special.

What Makes Thue-Morse Unique?

One of the standout features of Thue-Morse words is that they avoid certain repetitive patterns. It's like a game where you have to avoid being too predictable. This characteristic of being non-repetitive is a big deal in combinatorics, the branch of math that studies counting, arrangement, and combination of objects.

Generalization of Thue-Morse Words

Now, the fun doesn’t stop with just one type of Thue-Morse word. Researchers have taken the original concept and expanded it to larger sets of letters. Just like a musician can play the same tune in different keys, mathematicians have explored how changing the alphabet affects the properties of Thue-Morse words.

The story gets even more interesting when you consider the Complexities involved. When we talk about the complexities of a word, we're focusing on how many different ways you can arrange, or combine, the letters in it. It’s like searching for various ways to bake a cake with the same ingredients. The different combinations create a rich landscape of possibilities, each with its own charm.

The Complexity Game

When we talk about complexity, we can define it in terms of "binomial complexity." This is a mathematical way of saying, "How many unique parts can we find in a word if we look at segments of a certain length?" The Thue-Morse word and its generalizations have a specific method of counting these unique segments.

In simplified terms, if you look at small pieces of a Thue-Morse word, the challenge is to decide how many different unique pieces can be found based on the rules of counting. For instance, if you have a three-letter segment, how many different combinations can you create? This counting leads to a numerical value that reflects the richness of the word.

Discoveries and Patterns

Researchers have put in a lot of effort to analyze the properties of Thue-Morse words. One interesting result is that the complexity tends to repeat over time, similar to a catchy song that keeps coming back to its main theme.

As scientists delve deeper into the world of Thue-Morse, they not only uncover the beauty of these sequences but also find tools to aid in the analysis. One such tool is the concept of "abelian Rauzy graphs." This might sound fancy, but think of it like a map showing how different segments of the Thue-Morse words relate to each other. It's a clever way to visualize connections, making the abstract ideas a bit more concrete.

Applications of Thue-Morse Words

You might be wondering why we should care about these words. Well, Thue-Morse words aren’t just academic curiosities. They have real-life applications, from physics to economics. For instance, in physics, they help explain the unusual diffraction patterns seen in certain materials. It’s like how a unique camera lens might capture light differently, revealing new details about the world.

In economics, these words are used to ensure fairness in competitions. Simply put, they help design fairer games between two players by limiting predictability. So next time you play a game, remember the Thue-Morse word might be behind its design, ensuring it’s both challenging and fair.

Thue-Morse and Numbers

The links between Thue-Morse words and number theory are also exciting. The patterns of these words can be connected to various mathematical problems, such as how numbers can be arranged in sequences. Just as a knitting pattern can yield beautiful designs, these words can influence mathematical structures and relationships.

The Future of Research

Thue-Morse words continue to be a rich area of research. As mathematicians uncover more about these intriguing sequences, they are likely to find new applications and connections to other fields. Who knows? The next discovery could lead to a breakthrough in how we understand patterns in nature, technology, or even art.

Conclusion: A Quirky Legacy

In wrapping up, Thue-Morse words are more than just a collection of letters. They are a quirky blend of math, nature, and life. They illustrate how something seemingly simple can give rise to a wealth of complexity and beauty. So, whether in your next math class or while playing a game, remember the delightful twists and turns of the Thue-Morse word and its many complexities. They remind us that life, much like these words, is filled with unexpected patterns and fascinating discoveries waiting to unfold.

Original Source

Title: Computing the k-binomial complexity of generalized Thue--Morse words

Abstract: Two finite words are k-binomially equivalent if each subword (i.e., subsequence) of length at most k occurs the same number of times in both words. The k-binomial complexity of an infinite word is a function that maps the integer $n\geq 0$ to the number of k-binomial equivalence classes represented by its factors of length n. The Thue--Morse (TM) word and its generalization to larger alphabets are ubiquitous in mathematics due to their rich combinatorial properties. This work addresses the k-binomial complexities of generalized TM words. Prior research by Lejeune, Leroy, and Rigo determined the k-binomial complexities of the 2-letter TM word. For larger alphabets, work by L\"u, Chen, Wen, and Wu determined the 2-binomial complexity for m-letter TM words, for arbitrary m, but the exact behavior for $k\geq 3$ remained unresolved. They conjectured that the k-binomial complexity function of the m-letter TM word is eventually periodic with period $m^k$. We resolve the conjecture positively by deriving explicit formulae for the k-binomial complexity functions for any generalized TM word. We do this by characterizing k-binomial equivalence among factors of generalized TM words. This comprehensive analysis not only solves the open conjecture, but also develops tools such as abelian Rauzy graphs.

Authors: M. Golafshan, M. Rigo, M. Whiteland

Last Update: 2024-12-24 00:00:00

Language: English

Source URL: https://arxiv.org/abs/2412.18425

Source PDF: https://arxiv.org/pdf/2412.18425

Licence: https://creativecommons.org/licenses/by/4.0/

Changes: This summary was created with assistance from AI and may have inaccuracies. For accurate information, please refer to the original source documents linked here.

Thank you to arxiv for use of its open access interoperability.

Similar Articles