# Definition:Hilbert 23/18a

## Hilbert $23$: Problem $18$a

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### Existence of Non-Regular Space-Filling Polyhedron

There exists a non-regular space-filling polyhedron.

## Historical Note

The Hilbert 23 were delivered by David Hilbert in a famous address at Paris in $1900$.

He considered them to be the oustanding challenges to mathematicians in the future.

There was originally going to be a $24$th problem, on a criterion for simplicity and general methods in proof theory, but Hilbert decided not to include it, as it was (like numbers $4$, $6$, $16$ and $23$) too vague to ever be described as "solved".

## Sources

(translated by Mary Winston Newson from "Mathematische Probleme")