We give two formulas involving covering polynomials and use them to study projections C -> C*v for binary self-dual codes C and vectors v. The dimension of C*v is determined in terms of the weight of v and the number of codewords covered by v. These projections are very useful in the study of self-dual codes. An example is given proving some new properties of a doubly-even self-dual code with parameters [72, 36, 12].
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Nanyang Technol Univ, Sch Phys & Math Sci, Div Math Sci, Singapore 637371, SingaporeNanyang Technol Univ, Sch Phys & Math Sci, Div Math Sci, Singapore 637371, Singapore
Jia, Yan
Ling, San
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Nanyang Technol Univ, Sch Phys & Math Sci, Div Math Sci, Singapore 637371, SingaporeNanyang Technol Univ, Sch Phys & Math Sci, Div Math Sci, Singapore 637371, Singapore
Ling, San
Xing, Chaoping
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Nanyang Technol Univ, Sch Phys & Math Sci, Div Math Sci, Singapore 637371, SingaporeNanyang Technol Univ, Sch Phys & Math Sci, Div Math Sci, Singapore 637371, Singapore