Von Neumann cardinal assignment

The von Neumann cardinal assignment is a cardinal assignment which uses ordinal numbers. For a well-ordered set U, we define its cardinal number to be the smallest ordinal number equinumerous to U. More precisely:

$|U|={\mathrm {card}}(U)=\inf\{\alpha \in ON\ |\ \alpha =_{c}U\},$

where ON is the class of ordinals. This ordinal is also called the initial ordinal of the cardinal.

That such an ordinal exists and is unique is guaranteed by the fact that U is well-orderable and that the class of ordinals is well-ordered, using the axiom of replacement. With the full axiom of choice, every set is well-orderable, so every set has a cardinal; we order the cardinals using the inherited ordering from the ordinal numbers. This is readily found to coincide with the ordering via ≤_c. This is a well-ordering of cardinal numbers.

Initial ordinal of a cardinal

Each ordinal has an associated cardinal, its cardinality, obtained by simply forgetting the order. Any well-ordered set having that ordinal as its order type has the same cardinality. The smallest ordinal having a given cardinal as its cardinality is called the initial ordinal of that cardinal. Every finite ordinal (natural number) is initial, but most infinite ordinals are not initial. The axiom of choice is equivalent to the statement that every set can be well-ordered, i.e. that every cardinal has an initial ordinal. In this case, it is traditional to identify the cardinal number with its initial ordinal, and we say that the initial ordinal is a cardinal.

The α-th infinite initial ordinal is written $\omega _{\alpha }$. Its cardinality is written ℵ_α (the α-th aleph number). For example, the cardinality of ω₀ = ω is ℵ₀, which is also the cardinality of ω², ω^ω, and ε₀ (all are countable ordinals). So (assuming the axiom of choice) we identify ω_α with ℵ_α, except that the notation ℵ_α is used for writing cardinals, and ω_α for writing ordinals. This is important because arithmetic on cardinals is different from arithmetic on ordinals, for example ℵ_α² = ℵ_α whereas ω_α² > ω_α. Also, ω₁ is the smallest uncountable ordinal (to see that it exists, consider the set of equivalence classes of well-orderings of the natural numbers; each such well-ordering defines a countable ordinal, and ω₁ is the order type of that set), ω₂ is the smallest ordinal whose cardinality is greater than ℵ₁, and so on, and ω_ω is the limit of ω_n for natural numbers n (any limit of cardinals is a cardinal, so this limit is indeed the first cardinal after all the ω_n).

Infinite initial ordinals are limit ordinals. Using ordinal arithmetic, α < ω_β implies α+ω_β = ω_β, and 1 ≤ α < ω_β implies α·ω_β = ω_β, and 2 ≤ α < ω_β implies α^ω_β = ω_β. Using the Veblen hierarchy, β ≠ 0 and α < ω_β imply $\varphi _{{\alpha }}(\omega _{{\beta }})=\omega _{{\beta }}\,$ and Γ_ωβ = ω_β. Indeed, one can go far beyond this. So as an ordinal, an infinite initial ordinal is an extremely strong kind of limit.

See also

• Aleph number

References

• Y.N. Moschovakis Notes on Set Theory (1994 Springer) p. 198