OpenAI reports the circulant Hadamard classification
- Mathematics
A real circulant Hadamard matrix of positive order n exists exactly when n=1 or n=4.
OpenAI reports the circulant Hadamard classification
- Mathematics
A real circulant Hadamard matrix of positive order n exists exactly when n=1 or n=4.
Curated contributions 1
Understand the problem ↓Understanding the problem
Read the background
A real circulant Hadamard matrix of positive order n exists exactly when n=1 or n=4.
Why it matters
If correct, settles the circulant Hadamard conjecture and the remaining even-length obstruction for Barker sequences.
What counts as progress
Can a real circulant Hadamard matrix exist at any order besides one or four?
Website timeline
Publication dates and editorial changes.