Abstract

In mathematics, the creation and definition of new concepts is the first step in opening up a new field of research. Traditionally this step originated from intuition by a process of observation, analysis and abstraction. This article will show a general method by which most of the common notions of number theory, geometry, topology, etc., can be introduced in one and the same particular way. Therefore, we only need some of the tools of naïve set theory: a set of terms to which we apply an equivalence relation. This equivalence relation induces a partition of the terms with which we can consequently associate new concepts. By using this method’s ‘machine’ in an abstract way on arbitrary sets of terms we can create new notions at will, as we will show in this article, for instance, for bidecimal numbers of different kinds. The fact that we reverse the usual procedure of intuition before abstraction, doesn’t mean that we only create esoteric objects without any meaning. On the contrary, their abstract nature precisely provides our imagination with many possibilities for several interpretations in models in which they become useful. So, for example, we can use our bidecimal numbers to define elementary transformations on a cylinder or on a pile of tori.

Highlights

  • Many mathematical concepts went through a long process before they got their modern abstract definition

  • Let V be a set of coloured objects as follows (Figure 1): Rik Verhulst: A ‘Machine’ for Creating Mathematical Concepts in an Abstract Way, Bidecimal Numbers

  • Later on we will show that we can start from a partition of a set as well as from a surjective mapping of a set onto another to define new notions

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Summary

Introduction

Many mathematical concepts went through a long process before they got their modern abstract definition. We will use this ‘machine’ for creating totally new concepts in an abstract way, for example bidecimal numbers of different kinds. Let V be a set of coloured objects as follows (Figure 1): Rik Verhulst: A ‘Machine’ for Creating Mathematical Concepts in an Abstract Way, Bidecimal Numbers. The composition g of f and b is a surjective mapping from T onto M We use this three-step ‘machine’, equivalence relation, partition and mapping, for creating mathematical concepts. Later on we will show that we can start from a partition of a set as well as from a surjective mapping of a set onto another to define new notions. The equivalence relation R connects the objects with the same shape in subsets of V All these subsets form a partition of the set V. We can attribute names or symbols to the equivalence classes and represent them in a new set M, e.g. (Figure 3): 3. Examples of Well-known Concepts

Natural Numbers as Cardinals
Integer Numbers Let us choose as set of terms T the product set
Rational Numbers
Real Numbers
Parallel Lines to a Fixed Line A of the Plane
Lengths in the Plane
Starting from a Transformation Group G of a Set V
Notions in Daily Life
Bidecimal Numbers of the First Kind
Bidecimal Numbers of the Second Kind
Maximal Number of New Concepts Related to a Finite Set
Conclusion

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