#19872: regular symmetric Hadamard matrices for n=324
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Reporter: | Owner:
dimpase | Status: positive_review
Type: | Milestone: sage-7.0
enhancement | Resolution:
Priority: major | Merged in:
Component: graph | Reviewers: Nathann Cohen
theory | Work issues:
Keywords: | Commit:
Authors: Dima | 567608be0b53ec173be1f1a755af202c4a4de564
Pasechnik | Stopgaps:
Report Upstream: N/A |
Branch: |
public/JKandJKT |
Dependencies: |
#19861 |
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Description changed by dimpase:
Old description:
> Implements the construction from
>
> Z.Janko, H.Kharaghani, V.D.Tonchev, The existence of a Bush-type Hadamard
> matrix of order 324
> and two new infinite classes of symmetric designs. Des. Codes Cryptogr.
> 24(2001), 225-232
>
> and use it's RSHCD of '+' type to build an srg on v=324, k=153. Also, use
> it to construct an RSHCD of '-' type and build an srg on v=324, k=152.
New description:
Implements the construction from
Z.Janko, H.Kharaghani, V.D.Tonchev, The existence of a Bush-type Hadamard
matrix of order 324
and two new infinite classes of symmetric designs. Des. Codes Cryptogr.
24(2001), 225-232
and use its RSHCD of '+' type to build an srg on v=324, k=153. Also, use
it to construct an RSHCD of '-' type and build an srg on v=324, k=152.
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Ticket URL: <http://trac.sagemath.org/ticket/19872#comment:19>
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