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Kahn-Kalai counterexample to the Borsuk conjecture
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Mathematics
Area of mathematics
Geometry and topology
Euclidean geometry
Borsuk conjecture
Created
2026-09-24
Updated
2026-09-24
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Kahn and Kalai represented uniform
subsets
by quadratic
sign
vectors
so that
diameter
pairs
correspond to one forbidden intersection
size
. The
Frankl-Wilson theorem
bounds each smaller-
diameter
part,
forcing
exponentially many parts while the ambient
dimension
grows only quadratically.
Ancestors
(6)
Borsuk conjecture
Euclidean geometry
Geometry and topology
Area of mathematics
Mathematics
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Past exam of the mathematics course of the University of Cambridge
/
2025
/
iii
/
Paper 109
/
4
/
iii
/
Solution
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