Dedekind number bodes: * 88
Any number that can be found in the real world is a real number (R). Counting objects gives a sequence of positive integers, the natural numbers: N. If you consider having nothing or being in debt as a number, then the set of integers, including zero & negative numbers, is the set Z. If you cut a cake into equal pieces, then you may have a piece which represents a rational number, which is a number that can be represented by an irreducible fraction of two integers. This is the rational numbers or set Q. Finally the set of real numbers R, is the union between rational numbers (Q) and irrational numbers, I, the latter being numbers like the square root of 2. Set R is constructed by Dedekind cuts.
The Venn diagram illustrates the relationship between these number bodes or sets, N, Z, Q, I and R.