Strong partition cardinal

In Zermelo–Fraenkel set theory without the axiom of choice, a strong partition cardinal is an uncountable well-ordered cardinal $k$ such that every partition of the set $[k{]}^k$of size $k$ subsets of $k$ into less than $k$ pieces has a homogeneous set of size $k$.

The existence of strong partition cardinals contradicts the axiom of choice. The axiom of determinacy implies that ℵ₁ is a strong partition cardinal.

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