On symmetric and quasi-symmetric designs with the symmetric difference property and their codes
Journal of Combinatorial Theory Series A
Designs and their codes
On Spin Models, Modular Invariance, and Duality
Journal of Algebraic Combinatorics: An International Journal
Bose-Mesner Algebras Related to Type II Matrices and Spin Models
Journal of Algebraic Combinatorics: An International Journal
Symmetric Versus Non-Symmetric Spin Models for Link Invariants
Journal of Algebraic Combinatorics: An International Journal
On Four-Weight Spin Models and their Gauge Transformations
Journal of Algebraic Combinatorics: An International Journal
Characterization of SDP Designs That Yield Certain Spin Models
Designs, Codes and Cryptography
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H. Guo and T. Huang studied the four-weight spin models (X, W_1, W_2, W_3, W_4;D) with the property that the entries of the matrix W_2 (or equivalently W_4) consist of exactly two distinct values. They found that such spin models are always related to symmetric designs whose derived design with respect to any block is a quasi symmetric design. In this paper we show that such a symmetric design admits a four-weight spin model with exactly two values on W_2 if and only if it has some kind of duality between the set of points and the set of blocks. We also give some examples of parameters of symmetric designs which possibly admit four-weight spin models with exactly two values on W_2.