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1 year ago
gh-38070: Add skew Hadamard matrix of order 1588 Added the construction for spin type Goethals-Seidel difference family, described in the paper "Two classes of Hadamard matrices of Goethals- Seidel type" by D. Djokovic. This is done so that the skew Hadamard matrix of order 1588 is now present in SageMath. ### :memo: Checklist <!-- Put an `x` in all the boxes that apply. --> - [X] The title is concise and informative. - [X] The description explains in detail what this PR is about. - [ ] I have linked a relevant issue or discussion. - [X] I have created tests covering the changes. - [X] I have updated the documentation and checked the documentation preview. URL: https://github.com/sagemath/sage/pull/38070 Reported by: MatteoCati Reviewer(s): Dima Pasechnik, MatteoCati
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